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Gaddis, Vincent H.
   --- AMERICAN INDIAN MYTHS & MYSTERIES., Chilton Books., Radnor, PA 1977; Reprint by Signet Books., NY 1978; Thomas Nelson Sons, Ltd., Don Mills, Ont., Canada: Chapter - TUNNELS OF THE TITANS., pp. 47-57: Ancient tunnels and the Inner Earth.
   --- NOTES ON SUBTERRANEAN SHAFTS., Article in AMAZING STORIES magazine., Jan. 1949, pp. 148-151: Several reports of strange artificial shafts and tunnels that have been discovered throughout the world, which lead into the unexplored depths of the earth.
   --- SHAVERIAN SIDELIGHTS., Article in AMAZING STORIES magazine., Jan. 1949, pp. 130-133: Several native American "emergence" myths which state that their ancestors came from a subterranean world in ancient times.
   --- SHAVER MYSTERY, THE., Article in AMAZING STORIES magazine., Aug. 1947: Descriptions of the discoveries of eight different shafts which lead to the cavern world, including one in Kentucky, and one near Sulphur and Bromide Springs in Oklahoma. Also the writings of Dr. Maurice Doreal.
   --- TUNNELS OF THE TITANS., Article in AMAZING STORIES magazine., Aug. 1947, pp. 162-167: Several reports of ancient tunnel systems and stories of underground civilizations from all parts of the world.
Gardner, Marshall B. - A JOURNEY TO THE EARTH'S INTERIOR, OR HAVE THE POLES REALLY BEEN DISCOVERED? Aurora, IL n.p. 1913. Enlarged editions, 1920, 1926, Fieldcrest, n.d. Reprinted by HEALTH RESEARCH., 452 p.: One of the earlier writings to advance the theory of a hollow earth.
Gatewood, Joe - THE HOLLOW EARTH SOCIETY newsletter on the Inner Earth mystery, subterranean cities, and related subjects. The Hollow Earth Society, Frankfort, KY (no longer published).
Gatschet, Albert S. - A MIGRATION LEGEND OF THE CREEK INDIANS: Describes a journey made by hundreds of young Creek Indian braves in 1781, under the guidance of Chief Milfort, to a series of huge caverns near the Red River, about 40 miles 'above' the junction with the Mississippi river, from which the original Creek ancestors are believed to have emerged into the outer world in ancient times. According to 'Milfort', the caverns they saw "could easily contain 15,000 - 20,000 families." Also, pp. 105-107 records the Cha'hta Indian belief that their ancient ancestors emerged from NANI-WAYA (Bent or Curved Hill), a mound 50 feet in altitude, situated in Winston Co., Mississippi on the headwaters of the Pearl River, emerging just a few generations before the "white men" came to the Americas, according to some versions.
George, Wally - PILGRIMAGE TO THE DEVIL., Article in FATE magazine, Aug. 1957, pp. 38-52: A cave in a mountain five miles south of Ojinago, Mexico, which the inhabitants of the region believe to be the abode of 'devils'.
Gesner, Charles H. - Letter in AMAZING STORIES magazine, March 1947, pp. 171-173: Huge unexplored caves and a subterranean river with shores of gold-bearing sand, beneath the Kokoweef mountains of California. (Also see: Clark, Howard D.; Stringer, Sparks; & Klein, David)
Giannini, F. Amadeo - WORLD BEYOND THE POLES., Vantage Press, NY., 1959. 218 pp.: Admiral Byrd's Polar flight of 1947. A condensation of the material was copywrited in 1958 under the title, PHYSICAL CONTINUITY OF THE UNIVERSE, AND WORLDS BEYOND THE POLES: A CONDENSATION.
Gifford, E.W. - COAST YUKI MYTHS., Article in THE JOURNAL OF AMERICAN FOLKLORE, Vol. 50, p. 117: Yuki Indians' belief that their ancestors emerged in ancient times from a cavern  in "Hepinhehen" - a large rock-island in the ocean just off the coast, near Rockport, Mendocino Co., California.
Gibbons, Russell W. - VANISHING  ISLANDS OF THE ARCTIC., Article in FATE magazine, Dec. 1957., pp. 22-28: Several accounts of famous explorers who reported finding new Arctic lands and islands in the North Polar sea, which they were later unable to locate.
Gilbert, Rose Marie - INTERVIEW WITH BONNIE: A SUBTERRANEAN WOMAN SPEAKS. Taped conversation recorded by Ms. Gilbert, which took place in Los Angeles. Tape transcript edited and transcribed by Bruce Walton. (Also see: Hamilton, William F.)
Ginner, Al - THE HOLLOW EARTH. Dr. Swift's tape (tape #1817) on the Inner Earth.
Girvin, Calvin - THE NIGHT HAS A THOUSAND SAUCERS., Understanding Co., Merlin, OR - pp. 117-118: Describes a race of evil reptilian beings who long ago "...disappeared inside the earth at a point where the Earth's South Pole is today..." and...  "put themselves into a state of suspended animation." Reprinted in - UFO'S: KEY TO EARTH'S DESTINY, by Winfield S. Brownell., Legion of Light Publications. (Also see: Dickhoff, Robert  E. & Larsen, Harvey)
Goad, Janice - CAVE LEGENDS OF THE CENTRAL APPALACHIANS., Article in the NSS (National Speleological Society) newsletter TECH TROGLODYTE., Vol. 12, No. 2: Several strange caverns and the unusual stories surrounding them, including "Devil's Slide Cave" six miles SW of Tazewell, VA; and "Stoven's Cave" in Kentucky; from the depths of which strange noises are often heard to emerge.
Godwin, John - OCCULT AMERICA., pp. 176-177: Stories of underground cities and subterranean dwellers.
Godwin, Virgil
   --- BIZARRE SHAVER., Published by the author., Salem, OR 1982: The author's contacts with a subterranean race, his experiences with their UFOs, etc. The author has a profound interest in UFOs and Bigfoot, has taken thousands of photographs of UFOs, has appeared on talk shows, and claims to have been contacted by UFO occupants, a race of 8 ft. tall beings who live in tunnels and underground cities below the area of Lincoln Co., Oregon. They claim ancient ancestral ties with the American "Indians" - many of whom have "emergence" myths and legends of their tribes coming up and emerging from an underground world. (Also see: Letter from "Shu" in THE HOLLOW HASSLE newsletter, Fall 1979)
   --- INSIDE OUT., sequel to BIZARRE SHAVER. Published by the author.
Gofferel, Comte De - THE UNDERGROUND WORLD. 1654.
Goldstein, Lorrie - TUNNEL MONSTER OF CABBAGETOWN? Article in THE TORONTO SUNDAY SUN., March 15, 1979: A strange alien humanoid is sighted inside an unexplored tunnel beneath Parliament street in the lower-east section of the city of Toronto, Ontario, Canada (Reprinted in THE NEW ATLANTEAN JOURNAL., Fall 1979)
Goodman, Jeffrey - PSYCHIC ARCHEOLOGY: TIME MACHINE TO THE PAST., pp. 70-77: Ancient "Atlantean" "Hall of Records" containing priceless records, artifacts, and scientific knowledge, which runs beneath the Gizeh plateau in Egypt, beneath the Sphinx and the Great Pyramid, the entrance to which is believed to be hidden within the right paw of the Sphinx.
Goodwin, Grenville - MYTHS AND TALES OF THE WHITE MOUNTAIN APACHE., p. 20: A tunnel in the San Carlos Indian Reservation in Arizona, located on the north side of a bluff about a mile or two above Tl'uk'a'al'i, an old Indian farming site on the west fork of Cedar Creek, which is said to lead into the underground "land of the Ga'n People."
Gookin, K.A. - Letter in AMAZING STORIES magazine., pp. 168-170., Jan. 1948: The discovery of two unexplored, smooth, apparently man-made shafts or tunnels in Texas, one of them in the vicinity of Van Horn, Texas and another in "Hell Canyon" - a  southern offshoot of "Apache Canyon" next to "Apache Peak" - near the Texas salt flats. The latter was an extremely ancient tunnel which ended against a smooth, very cold marble wall, from behind which strange "roaring sounds" could be heard.
Gordon, Helen C. - Letter in the SHAVER MYSTERY MAGAZINE., Vol. 1, No. 2., 1947., pp. 32-34: An abandoned "mine" in the Organ mountains of New Mexico, about 60 miles NW of El Paso, Texas, which the writer and her husband explored, and within which they discovered an immense "bottomless" pit or shaft, also known as a "Glory Hole", which earlier miners had partially walled-off.
GOSHEN STONE TUNNELS,  THE - Article in YANKEE magazine, Nov. 1971: A prehistoric well and tunnels, many of them unexplored, near the cemetary in Goshen, MA. (Also appeared in INFO JOURNAL)
Grandes, Puentes - SUBTERRANEAN MARVELS., Tau University Publishing Co., Minneapolis, MN. Excerpt from GHOSTLAND, by Emma H. Brinten. 31 pp.
GRAVE MATTER - Report in SEARCH magazine., Oct. 1942 (reprinted  in THE HOLLOW HASSLE newslettere,  Oct. 1981). An old cemetary in Spain, now submerged by the waters of a hydro-electric project., the  graves in which were one day found to be empty, and the excavations seemengly bottomless! Since refilling the graves proved to be a difficult if not impossible task, they were boarded over, sealed with mortar, and fenced in.
Greene, Vaughn M.
   --- ASTRONAUTS OF ANCIENT JAPAN., Merlin Engine Works Publishers., Millbrae, CA., pp. 79-85: Chapter - "The Crystal Caves of Shaver".
   --- Letter in the SHAVERTRON newsletter ( http://www.shavertron.com ) No. 14: A possible tunnel entrance at the bottom of an elevator landing deep beneath Hoover Dam near Las Vegas, Nevada, where there is a "wild tile inlay on the floor, with signs of the zodiac and all sorts of stuff suggesting an entrance." Also refers to the caverns that were reportedly broken into and re-sealed during the construction of the dam.
Grene, Bob - THEY'RE PLANNING A VISIT TO THE LAND OF THE HOLLOW EARTH., Article in the STATES-ITEM.,  New Orleans, LA., Sept. 11, 1978 (reprinted in THE HOLLOW HASSLE newsletter, Oct. 1981): Tawani Shoush, president of Missouri's Hollow Earth Society, announces plans to visit the poles in hopes of discovering the alleged enterances into the hollow earth.
Grew, Edwin S. - THE ROMANCE OF MODERN GEOLOGY., Seely & Co., London., 1911: Argues the impossibility of the "theory" of a molten interior of the earth, and also the theory that the earth is "solid" through-and-through is unlikely: "...We know that the earth cannot be solid all through because it does not weigh enough."
Griffin, Howard F. - Letter in SHAVER MYSTERY MAGAZINE., Vol. 1, No. 2., 1947., p. 35: Vast caverns within the interior of Pike's peak in Colorado, from which sounds of occasional subterranean cavern-rock-slides have emerged.
Grumley, Michael - THERE ARE GIANTS IN THE EARTH., Panther Books Ltd., St. Albans., Herts, England., 1976.,  pp. 42-47: Refers to an ancient tunnel on the Ecuador-Columbia border, inhabited by giant "Ape-Men" and which is believe to contain some of the answers to the mysteries of the beginning of civilization on Earth.
Gudde, Erwin G. - CALIFORNIA PLACE NAMES., University of California Press., Los Angeles, CA., 1962., p. 194: Moaning Cave, near Cave City, Calaveras Co., CA., whose large dome-like vault was so named because of a strange sound heard at the entrance. The "moanong" disappeared after a circular stairway was built in the main chamber.
Guenon, Rene - KING OF THE WORLD., California, 1922. (refers to the so-called "King of  the World", or the leader of the subterranean network of "Agharti", beneath Mongolia and surrounding regions).
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Haigler, Frank W. - Letter in AMAZING STORIES magazine., Jan. 1948.,  pp. 164-165: Confirms reports of the discovery of ancient man-made tunnels, not completely explored, about six miles west of Burley, Idaho. (Also See: Haycock, George)
Hall, Manly P. - MAN: THE GRAND SYMBOL OF THE MYSTERIES., Manley P. Hall Pub. Co., Los Angeles, CA., 1932., p. 160: Refers to the "Caverns of the Mysteries" used by the ancients for initiations; the cave-dwelling Richiís of India; the seven  ancestors  who emerged from caves; and the cavern of Zoroaster.
Halley, Edmund - Essay in PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY., 1692: Halley argues indicators that the earth has "shell" about 500 miles thick, a central "sun", and two concentric spheres capable of supporting life. Halley, who is well known for the discovery of the famous comet named after him, was one of the first theorists (including Cotton Mather, etc.) to advance the idea  of a Hollow Earth. (Also see: Armitage, Angus)
Halliday, William R. - DEPTHS OF THE EARTH., pp. 367-370: One of the world's largest caverns may exist beneath the massive limestone strata located beneath the Coconino Plateau and the Grand Canyon region of Arizona. Much geological evidence supports such a claim, and the author also suggests that further exploration of "Sipapu Cavens" may disclose something of interest.
Hamilton, Edith - MYTHOLOGY: Stories of underground tunnels and cities in Sicily.
Hamilton, William F.
   --- CENTER  OF THE VORTEX., published by the author., Glendale, AZ: the Vortex theory of the earth's formation is explained.
   --- THE HOLLOW-VORTEX EARTH., Article in SEARCH magazine., Summer 1980., pp. 45-46.
   --- BONNIE's MISSION., Article in THE NEW ATLANTEAN JOURNAL., Spring 1981.
Hand, Wayland D. - CALIFORNIA MINERS' FOLKLORE: BELOW GROUND., Article in  THE CALIFORNIA FOLKLORE QUARTERLY., April 1942., pp. 128-132: Several reports of encounters by miners with "little people" in certain California mines, including the Mayflower Mine, east of Nevada City, CA., where strange sounds were said to emanate from one particular long tunnel.
Hansen, L. Taylor
   --- THE ANCIENT ATLANTIC., Amherst Press., Amherst, WI., 1969., Refers to the Tuaregs, an African Berber tribe which tells strange tales of underground cities built by survivors of Atlantis.
   --- THE SEARCH FOR THE CITY OF SEVEN CAVES., Article in AMAZING STORIES magazine., Nov. 1948., pp. 143-145: Caves, tunnels, and subterranean cities beneath the area of Tiahuanaco, Peru (Also see: Letter in the Feb. 1948  issue of AMAZING STORIES., p. 164)
Harbinson, W.A. - GENESIS., Dell Pub. Co., NY., 1982., paperback, 605 pp. (A slightly different edition was published in Great Britain by Corgi Books): The story of an evil man (genius) named Aldrich who is attempting to rule the world through the use of secretly-developed high technology, including flying discs created by a secret society descended from the Nazis, who are headquartered in caverns beneath Antarctica. This realistic yet fictional account borrows heavily from actual yet suppressed characters and events from 'UFO history'.
Harner, Michael - THE WAY OF THE SHAMAN. The book describes several alleged "astral trips" into the ancient tunnels and the lower (cavern) world.
Harper, Penny - INNER EARTH ENTRANCES IN GUATEMALA. An essay appearing in Bruce Walton's self-published manuscripts, INNER EARTH ENTRANCES., Vol. 6: Four strange tunnels that the writer learned of during her travels in Guatemala, one of which she explored for some distance. There is also 'Silpino' cave in Eastern Guatemala, next to a major road leading to the east coast, which has been explored for weeks and even months without finding its end.
Hart, John H. - I SEARCHED FOR ETIDORHPA - Article in SEARCH magazine., Dec. 1963., pp. 62-68: The author's expeditionary attempts to find the "Caves of Zoroaster" which, according to John Uri Lloyd's book ETIDORHPA, are located somewhere in Livingston county, Kentucky.
Hartman, Franz - AMONG THE GNOMES: A man who entered a cave in the "Untersberg" mountain in the Austrian Alps, encounters its diminutive inhabitants.
Hasting - HASTING'S ENCYCLOPEDIA OF RELIGION AND ETHICS. Section: "Abodes of the Blest": The Persian tale of "Yimavara" - an underground city built by a so-called 'god' by the name of "Yima".
Haycock, George - Letter in AMAZING STORIES magazine., Oct. 1947., pp. 174-175: The author's discovery of an ancient man-made tunnel which he believed led to massive underground caverns which figure in local Indian legends, and the entrance to which was hidden among a pile of boulders about six miles west of Burley, Idaho. (See also: Haigler, Frank W.)
Hayes, Christine, Ed. - THE SOURCE Newsletter (published by 'The Rainbow Earth Dwelling Society'). Quarterly. Contained information allegedly received and 'translated' by the editor from the "Inner-terrestrials" or several races of subterranean beings who exist in the Cavern Worlds and within the Hollow interior of the Earth.
Hayes, Paxson C. - Writings appearing mainly within the B.S.R.F. (Borderland Sciences Research Foundation) publication ROUND ROBIN: The author's discovery of the mummified remains of a race of 7-ft. humans whom he believed lived in huge caverns 9,000 ft. deep, in  prehistoric times. He also believed that UFOs originated from the center of the earth, emerging through the "polar vent".
Haward, Dr. Winifred - HIDE OR HANG: Records stories of secret rooms and tunnels in northern England.
Hefferlin, W.C. & Gladys
   --- A DESCRIPTION OF RAINBOW CITY FROM THE HEFFERLIN  MANUSCRIPT - PART 1: Reprinted in part by B.S.R.F., CA. Circa 1960., 48 pp: The discovery of an extremely ancient subterranean city near the South Pole in which the remains of a highly advanced civilization were found; as well as the re-activation of the city in recent years.
   --- A DESCRIPTION OF RAINBOW CITY FROM THE HEFFERLIN MANUSCRIPT - PART 2: Arcturus Books., 1948. (Much of the 'HEFFERLIN MANUSCRIPT', which comprises about 160 pages, remains unpublished, and the preset location of the original manuscript is uncertain)
Henderson, Kenneth - Letter in AMAZING STORIES magazine., Nov. 1947., p. 174:  The alleged discovery by the U.S. Army of six 'spaceships' in some caverns in Mexico.
HESPRS BULLETIN. (See: Elvers, Gary)
Hewett, Edgar L. - HANDBOOKS OF ARCHAEOLOGICAL HISTORY., pp. 23-24: The 'Tewa' Indian legend that their ancestors in ancient times emerged from "Sip'ophe" - a cave near a small, brackish lake which, according to some, never dries up. Located within the Great Sand Dunes National Monument, NE of Alamosa, CO. Also the story of "Keres holes" - two ancient tunnels located in a cliff on the Oja Caliente Creek, near La  Cueva, Taos Co., NM., from which the Keres Indians are believed to have emerged following an underground migration in ancient times. The author, after investigating these tunnels, claimed that their floors and walls were smooth and 'flesh-colored'.
Heyerdahl, Thor - MR. HEYERDAHL SPEAKS UP., article in FATE magazine, Sept. 1958., p. 19: An account of secret caverns beneath Easter Island, where the explorer - under the guidance of certain natives - saw fantastic stone sculptures and artifacts from a prehistoric civilization.
HIDDEN WORLD Magazine - See: Palmer, Raymond A.
Hight, Roger C.
   --- ATLANTIA: PART 1., Roger C. Hight Productions., Phoenix, AZ., unpublished: A fictional work based on information gathered over several years of Inner Earth research, and considered to be an accurate portrayal of life inside the Earth. (The author was planning to produce a movie titled "ATLAN", based on this work)
   --- ATLANTIA: PART 2., Roger C. Hight Productions., Phoenix, AZ., Unpublished: An explanation of the 'Hollow Earth' theory, with contributions by some well-known researchers and writers in the field, including Brad Steiger, David H. Lewis, Frank Howard, Brinsley Le Poer Trench, Kenneth Snell, Bruce Walton, Hal Crawford and Don Boyd.
Hillinger, Charles - AN UNDERGROUND CATHEDRAL., Article in the LOS ANGELES TIMES., March 2, 1975: Reprinted in THE HOLLOW HASSLE newsletter., May, 1981: A  mysterious maze of underground tunnels and rooms discovered beneath the surface of Eureka, Nevada.
Himself (Anonymous) - A VOYAGE TO THE WORLD IN THE CENTRE OF THE EARTH., S. Crowder & Woodgate., London., 1755: A man allegedly enters an Inner World by way of Mt. Vesuvius in Italy, and encounters the inhabitants of a cavernous world.
Hine, C.G. - THE OLD MINE ROAD., Rutgers., The State University., 1963., p. 120: A formerly lost "Indian mine" in New Jersey from which a strange "light" occasionally emerges.
Hitching, Francis - THE MYSTERIOUS WORLD., 1978: Contains information on mysterious tunnels which have been discovered.
Hoag, Helen I. - ALICE'S TRIP TO THE INNER EARTH., article in MEET THE LORDS Newsletter., Awareness Research  Center., Feb. 1973; reprinted in THE HOLLOW HASSLE newsletter., Vol. 1, No, 12: An 'astral' journey through the interior of the earth, where the subject allegedly encounters tunnels, subterranean shuttles, underground cities, vast subterranean space ports, and a fantastic civilization of strange humanoids.
Hudson, Geoffrey - THE KINGDOM OF FAERIE., William Rider & Son Ltd., London., 1927., pp. 66-67: Refers to the subterranean kingdom of PAN, inhabited by a host of legendary creatures "like the old PAN world of Greek mythology".
Hoffagle, John H. Jr. - LETTER FILE ON PRIVATE LETTERS OF SHAVER HYPOTHESIS., Issues: Sept. 15, 1950; Oct. 1, 1950; Nov. 20,1950; Jan. 1951: A collection of letters concerning the "Shaver Mystery" which deals with two warring subterranean races, the benevolent Teros (or T-Forces) vs. the malevolent Deros (or D-Forces).
Holland, Ralph M. - A VOICE FROM THE GALLERY; Issues: June 1949; Spring 1958; etc. (28  issues published) Material on the Inner Earth mystery and the "Shaver" hypothesis.
HOLLOW EARTH, THE - Article in the COURIER EXPRESS., Buffalo, NY., Feb. 8, 1981; Reprinted in THE HOLLOW HASSLE  newsletter. Refers to the "Symmes" theory of hollow 'concentric' spheres.
HOLLOW EARTH BULLETIN., publication of "The Hollow Earth Society", England. (The only reference to this publication found by the editor appears in the book: THE HOLLOW EARTH, by Eric Norman)
HOLLOW EARTH CIVILIZATIONS ... DO THEY EXIST? - Article in THE PYRAMID GUIDE., Nov.-Dec. 1977: The Hollow Earth and the legendary subterranean civilizations of Shambhala-Agharta.
HOLLOW EARTH NEWS., Dennis Feeback, Ed., co-edited  by Joe Gatewood., The Hollow Earth Society of Kentucky., Frankfort,  KY: First issue - Oct. 1981: Material on the Inner Earth, Subterranean Cities, Polar shifts, and related subjects, as well and news and developments in the Hollow Earth field. (No longer published; Also see: Kafton-Minkel, Walter - THE LEGEND OF MT. SHASTA)
HOLLOW HASSLE, THE: Newsletter. Also see: Martin, Mary & Davis, Mary
   --- Vol. 2, No. 1: The discovery of a mysterious stone stairwell leading into a network of unexplored caverns beneath the Caribbean Island of Bonaire.
HOLY BIBLE, THE: Several scriptures refer to possible physical inhabitants of the earth's cavernous  interior, including: Gen. 9:4; Matt. 12:40; Eph. 4:9; Phil. 2:10; & Rev. 5:3.
Homet, Marcel - SONS OF THE SON., Neville Spearman Ltd., London 1963: A Maku Indian chief gives specific directions on how to find and enter an ancient underground lost city beneath the Parima Mountain range in Brazil. Pp. 123-124: Instructions of how to enter through a high wall containing a "stone gate under a great arch which leads into the earth" that is located near the Urari-Coera river near the Sierra Parima mountains on the Venezuelan-Brazilian border. Pp. 154-156: Refers to the "Subterranean People of Tierra Dentro."
Horak, Antonin T.  - THE MOONSHAFT. Article in NSS NEWS (N.S.S. - National Speleological Society Inc.,  Huntsville, AL)., March 1965: The discovery of an ancient, man-made shaft within a mountain cave in  Czechoslovakia. (Also see: Bergier, Jacques & the editors of INFO)
Hoskins, Cyril T. - See: Rampa, T. Lobsang (Pseud.)
Hovey, Horace C. - CELEBRATED AMERICAN CAVES: Refers to the "Moodus Noises" which emerge from Mt. Tom in Connecticut, and the belief by some that they are due to "explosions of gas in subterranean cavities, which indicate the existence of a large vacuity underneath southern New England."
Howard, Dana
   --- VESTA, THE EARTHBORN VENUSIAN., Essene  Press, Corpus Christi, TX. 1950: Tells about a remnant from an ancient civilization still in existence underground, within one of the mountain ranges near the Imperial Valley area of California.
   --- Letter in THE SHAVER MYSTERY AND THE INNER EARTH, edited by Timothy Green Beckley (Gray Barker Books): The writer's brief psychic war with the "frog people" - detrimental beings that live in the interior of the earth.
Howard, Joan - THE SPACE - OR SOMETHING - CONNECTION., Published by the author: Astral or "remote viewing" investigations of ancient underground tunnels.
Howard, Rex Du - LEGEND OF QUINMAS VALLEY., Article in AMAZING STORIES magazine, Dec. 1946., pp. 24-25: Reprinted in SEARCH magazine, Aug. 1957., 22-25: An ancient tunnel near Quinmas Valley in Chatham Sound, southern Alaska, which was found to lead to a huge subterranean cavern-city, abandoned long ago by an intelligent race of human giants. In relatively recent times these giants returned from the stars to re-establish their underground city which had been invaded and occupied by a degenerate race of dwarfs during their long absence, according to the native "Indians" of the area whom the writer interviewed.
Howell, Martin A. Jr., - IS THERE A SUBTERRANEAN OUTLET TO THE UPPER LAKE REGION? A thesis in SCRIBNER'S MONTHLY, date uncertain: The writer's belief in the existence of a gigantic subterranean cavern system connecting Lake Superior with the Mississippi River.
Hruskocy, Phil - THE HOLLOW EARTH AND THE FREEDOM OF INFORMATION ACT., Article in SEARCH magazine., Spring 1977: Refers to Government secrecy and coverups of what really happened during Admiral Richard E. Byrd's flight to the North Pole.
Hudson, L Frank - Manuscript. 10 pp.: Secret tunnels beneath Washington D.C. Also refers to similar information in INNER EARTH ENTRANCES, by Bruce Walton., Vol. 1-A, p.63.
Huguenen, O.G. - FROM THE SUBTERRANEAN WORLD TO THE SKY - FLYING SAUCERS., published in Brazil: The author was a member of the "Brazilian Theosophical Society".  Theories concerning the origins of some "Flying Saucers" originating from the earth's interior. (Also see: Bernard, Raymond W. - THE HOLLOW EARTH)
Humboldt, Alexander Von - VIEWS OF NATURE - (OR, CONTEMPLATIONS ON THE SUBLIME PHENOMENA OF CREATION)., H.G. Bohn, London., 1850., pp. 412-413: An account of the "subterranean gardens" beneath Cajamarca (Caxamarca), Peru., containing ancient Incan gold, finely-crafted golden 'trees', and other wonderful treasures.
Huntington, O.B. - Article in YOUNG WOMAN'S JOURNAL (LDS church)., March 1892., pp. 264: Describes a warm and fruitful land 'beyond' the North Pole, "a country inhabited by the ten tribes of Israel. It is divided by a river, on one side of which lives the half-tribe of Mannasseh, which is more numerous than all the others." (Mannasseh is one of the two sons of Joseph, and is the brother of Ephraim [both half-tribes are part of the 'Josephite' tribe]. Some believe that 9 Ĺ tribes disappeared to the North, and that half the tribe of Levi stayed behind in Israel with the "Jewish" tribes of Judah and Benjamin who compose the modern-day 'Israelis'. However there are some who believe that Britain and North America are largely composed of the descendants of Ephraim and Mannasseh, which the Biblical text says are two Israeli tribes - sons of Joseph who was sold into Egypt and had many children - that would multiply and be very fruitful.
Hutin, Serge - ALIEN RACES AND FANTASTIC CIVILIZATIONS., J'Lu, Paris., 1970; U.S. Edition - Berkeley Medallion Books., 1975., Chapt. 6., pp. 109-132 - IN THE BOWELS OF THE EARTH: Refers to the mysterious catacombs beneath Paris, and other underground mysteries.
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Illion, Theodore (Ted) - THE SECRET CITY IN THE VALLEY OF MYSTERY., Excerpt from DARKNESS OVER TIBET., Rider & Co., London, n.d. Circa 1947; Reprinted by B.S.R.F.: The author describes his frightening adventure in a secret underground city of devil-worshipers, built around a "bottomless shaft" leading to even more hellish domains, in a remote region of Tibet.
Inca, The (pseud.) - I FOUND SHAVER'S CAVES! Article in SEARCH magazine, March 1960., pp. 26-29: The writer's discovery of an entrance to the subterranean world in the Matto Grosso region of Brazil, and his meetings with a subterranean man of "Atlantean-Inca" descent, who invited him, along with his family and friends, to come and live with his people in the utopian underground cities.
INFO JOURNAL (The "INternational Fortean Organization" - Science and the Unknown)., Arlington, VA: Occasional references to strange tunnels and other underground anomalies.
   --- Vol. 2, No. 2.,  p. 7: Prof. Hapgood's discovery of a stone staircase leading down into the earth at Acambaro in central Mexico, now filled with hard-packed volcanic material. The site is located on the Muzquiz property. P. 30: The "Souterrain" or Giant's Hole, home of troglodytes and Gog-Magog, etc. These giant 'graves' or 'passage tombs' are said to be exact counterparts of early passage tombs of Japan, and are located in Cornwall, England (linking Scots, Scythians, and Mongolians).
   --- Vol. 3, No. 3, p. 24: The discovery of strange tunnels in Goshen, MA., Milford, CT., and Crofton, MD (Also see: GOSHEN STONE TUNNEL; STRANGE TUNNEL; CROFTON TUNNELS).
Ives, Franklin Titus - THE HOLLOW EARTH., Broadway Publishing Co., New York, 1904.