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Daniken, Eric Von - THE GOLD OF THE GODS, 1972, Bantom Books, NY., 1973: Hundreds of miles of ancient tunnel and cave systems beneath the surface of Ecuador and Peru, discovered by Juan Moricz, an Argentinian ethnologist.
Danske, Holgar - Writings of, concerning his visit to the interior of Germany's Untersburg Mountain.
Davidson, Cherrie - Letter in THE HOLLOW HASSLE, Vol. 1 - No. 3: Discovery by a man named "Bones" of  ancient subterranean tunnel containing prehistoric remains of giant Lemurians in southwest Nevada. (Also see: Carson, Will)
Davidson, Leon - Letter in FLYING SAUCERS magazine, referring to "underground tunnels in the California desert, at Camp Irwin, near Barstow."
Davis, Mary - (See: LeVesque, Mary; & Martin, Mary)
Davy, Sir Humphrey - Writings concerning his theory, based on certain scientific indications, that the earth's center is not hot.
Day-Ga-Chee - (See: Millet, Clair)
DeCamp, L. Sprague
   --- LOST CONTINENTS., Dover Publishing Inc., NY., 1954, p. 8: The legend of Euenon and Leukippe, reputedly the two original ancestors of the Atlantean race, who legend says... "sprung from the earth..."
   --- (& Willy Ley) - FROM ATLANTIS TO ELDORADO: References to the 'Symmes' theory of the hollow earth.
   --- LANDS BEYOND., Rinehart & Co. Inc., NY., 1952: Legends and stories regarding Mt. Shasta in northern California.
DeCourcy, John & Dorothy - Letter in AMAZING STORIES magazine, Dec. 1946, p. 173:  The "Man from Agharti" - an emissary from the subterranean kingdom of Agharti, who brings a message from the 'King of the World' to the authors, John & Dorothy DeCourcy.
DeGofferel - THE UNDERGROUND WORLD., 1654: Underground residents, underground "towns", etc.
Denton, William & Elizabeth M.F., - THE SOUL OF THINGS (or, PSYCHO-METRIC RESEARCH AND DISCOVERIES)., Denton Pub. Co., Wellesley, MA., 3 vols., 1886: Alleged psychometric (or clairvoyant-astral) travels and explorations of subterranean regions and warm Polar countries - and their inhabitants.
Derr, John S., (see: Story, Ronald)
Derry, Francois - THE EARTH IS ALIVE., Arlington Books, London, 1968., & other editions by Planete Co., Paris: Chapter: FANTASTIC EARTH(S)., pp. 59-65: Material concerning the Inner Earth.
Devanda - UFO AND THE BLACK LODGE., Article in SEARCH magazine, April 1958, pp. 46-51: A secret society composed of negative entities who in ancient times retreated into caverns below the surface of the earth.
Deyo, Stan - THE COSMIC CONSPIRACY., p. 57: Ninety-six secret 'underground cities' built by the government to be used for the refuge of officials and bureaucrats in the event of a natural disaster or a nuclear attack.
Dickhoff, Robert E., - AGHARTA., Fieldcrest Publishers; Reprint by 'Health Research': The warring Martian and Venusian 'gods' of ancient times and their prehistoric cities and tunnel systems which they constructed beneath the earth's surface. The 'serpents', an evil race, many of which lie in suspended animation beneath the ice and snow of Antarctica. (Also see:  Girvin, Calvin; &
Dick, William - ADVENTURERS BATTLE CAVE TRIBE ON WAY TO 'CENTER OF THE EARTH'., Article in the NATIONAL EXAMINER, April 13 1982. The progress of cave explorers in their attempts to set a new world depth record in one of Mexico's largest cavern systems, and superstitious native 'tribes' in the area who are determined to stop them. (Also see: Jordon, Jay)
Dixon, Roland B., - OCEANIC MYTHOLOGY., p. 168: Native Australian traditions that their ancestors "came up out of the ground" and traveled about the country and created new tribes, then "ultimately journeyed away beyond the confines of their territory, or went down into the ground again."
Doerr, Paul - UNKNOWN Newsletter (no longer published)., Issue No. 6: A subterranean race of giants which, according to native traditions of the Carolines, especially Papua, went underground in ancient times. Once inhabitants of the lost continent of "Chamat" - they will, according to tradition, one day "emerge and remake the world." This legend is spread widely throughout Malaysia. The same issue also reports on the discovery of massive caverns in Toulumne Co., CA, by three Oakland miners. The caverns were so extensive that a man would have to "take grub for a week, and plan to explore for a month."
Doreal, Maurice
   --- THE BANNER OF SHAMBHALA., Brotherhood of the White Temple (B.W.T.)., Little Temple Library Ed., circa 1948., 17 pp.
   --- MYSTERIES OF MOUNT SHASTA., B.W.T., Little Temple Library., 1949., 19 pp.
   --- MYSTERIES OF THE GOBI., B.W.T., Little Temple Library: Shambhala, a hidden kingdom located below the Gobi desert.
   --- POLAR PARADISE., B.W.T., Little Temple Library., 1949., 21 pp.
   --- SHAMBHALA: or THE GREAT WHITE LODGE; B.W.T., Little Temple Library., 1949., 20 pp.: Doreal's visit to the 'Great White Lodge', located beneath the surface of the Earth.
   --- THE INNER EARTH., B.W.T., Little Temple Library., 21 pp.
   --- THE INNER EARTH., Chapter in THE SUBTERRANEAN WORLD, by Timothy Green Beckley (ed. by)., Gray Barker Books: The Inner Earth and subterranean life as it was taught to Doreal by the so-called 'masters of ancient wisdom'.
Donnelly, Ignatius - THE DESTRUCTION OF ATLANTIS, RAGNAROCK: THE AGE OF FIRE AND GRAVEL., Steiner Books., Blauvelt, NY., 1971 Ed., Chapt. 7: Various worldwide beliefs in subterranean life, native emergence legends, etc.
Douglas, Mary S., - EVERGLADES SEA OF GRASS., Rinehart & Co., NY., 1974., 501 pp.: Information relating to the Inner Earth.
Drake, Eugene - VISITORS FROM SPACE., Ventla Verlag, Wiesbaden, W. Germany., 1961., p. 44: The author's belief in three types on Inner Earth races: the Rainbow People, some degenerate races, and an old civilization below Mexico.
Drake, W.R.
   --- GODS AND SPACEMEN IN THE ANCIENT WEST., N.A.L. Co., 1974., p. 145: The caverns of 'Agharti' and caverns beneath the Slavic lands.
   --- THE GREEN PEOPLE., Article in SEARCH magazine, Winter 1979-1980: The "green children of wolf-pits" and the "green children of Spain" who were seen to emerge, more than 700 years apart, from subterranean lands "without sun, and dimmed by perpetual twilight". (Also see: Beckley, Timothy Green - THE SHAVER MYSTERY AND THE INNER EARTH; & Trench, Brinsley le Poer - SECRET OF THE AGES)
Driggers, Bruce - Letter in Ray Palmer's FLYING SAUCERS magazine., June 1976: Describes a thesis he wrote on the Hollow Earth.
Duplantier, Gene - SUBTERRANEAN WORLDS OF PLANET EARTH., SS&S Publications: Accounts of encounters with the underworld and its inhabitants, including chapters by Richard S. Shaver and other Inner Earth researchers.
Duverus, Edward D. - Letter in HIDDEN WORLD magazine, Winter 1962: Three underground cities, each located beneath deserts and entered through nearby mountains, inhabited by beings neither totally evil or saintly, and who are able to blend with surface society like chameleons, virtually undetectable except for the lack of color in the irises of their eyes.
DYZAN, BOOK OF (author unknown) - Speaks of "superior beings of dazzling aspect" who abandoned the surface of the earth, depriving the 'impure' human race of their knowledge, leaving in flying craft to rejoin their land "of iron and metal."
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EARTH'S CRUST IS JUST A MILE THICK IN SPOT ON FLOOR OF ATLANTIC, EXPERTS BELIEVE - Article in the ARIZONA REPUBLIC., Dec. 2 1981: Discovery of an area in the mid-Atlantic Oceanic Ridge between South America and Africa where the earth's crust is thinnest.
Eavis, A.J., Ed. by - CAVES OF MULU 1980: THE LIMESTONE CAVES OF THE GUNUNG MULU NATIONAL PARK, SARAWAK., Royal Geographical Society., London; also: CI Books., Calgary, Alberta, Canada. The discovery of the world's largest known (at the time) surveyed cavern chamber (approx. 230 ft. wide and 980 ft. long, and nowhere less than 270 ft. high, large enough to easily hold within itself the two previous contenders for the world's largest cavern chamber:  Carlsbad's 'Big Room' and the 'Salle de la Verna' in the Pierre Saint-Martin. Yankee Stadium could also fit in one end. Sarawak is a part of the nation of Malaysia on the island of Borneo.
Edrehi, Rev. Dr. M. - THE TEN TRIBES., London, 1852: The unknown history of the Lost Tribes of Israel after they were taken into captivity, and their migration and disappearance to the 'north'.
Eichorn, Arthur F. - THE MOUNT SHASTA STORY., Forbes & Co., Chicago, IL., 1957: The history of Mt. Shasta in northern California, and the legends and stories of ancient 'Lemurians' who are said to reside in its interior. Other strange occurrences and phenomena associated with the mountain are described.
Eliade, Mircea - ZALMOXIS, THE VANISHING GOD., Univ. of Chicago Press., 1959; pp. 24-30: 'Thracian' and 'Dacian' legends of the underground chambers of Andreon, occupied by the ancient so-called 'god' Zalmoxis.
Elvers, Gary., Ed. by - HESPRS BULLETIN., Hollow Earth - Saucer & Phenomena Research Society., Logansport, IN.: Nine bulletins published, beginning with No. 1 (Jan.-Feb. 1971): Contains information on the Hollow Earth, and UFOlogy.
Emerson, Ellen R. - INDIAN MYTHS: Native Cuban belief that their ancestors emerged in ancient times from two caves in a mountain on their island.
Emerson, Willis George - THE SMOKY GOD., 1968. Reprint by Palmer Publications., Amherst, WI., illus.: Olaf  Jansen, a Norwegian fisherman, and his father, enter an interior world through an opening near the North Pole, where a highly advanced race of giant humans who spoke a language similar to ancient Sanskrit live. They stayed with these remarkable people for nearly two years before returning to the outer world through a similar opening near the South Pole.
Etter,  Francis R. - Letter in SEARCH magazine., Sept. 1960; pp. 50-52: Refers to an article in THE ATLANTIC MONTHLY (date uncertain), written by Dr. William Beebe (an oceanographer who disappeared under strange circumstances), in which he expressed his belief in "...the coming invasion of the [surface of] earth by an underground race."
ENTOMBED MINERS STAIRCASE TO HEAVEN, THE; by Bill Schimeer; Article in FATE magazine, March 1965, pp. 28-37. The experiences of miners Henry Throne and David Fellin in a mine in Sheppton, Pennsylvania. (Also see: Calais, Ronald A., & Schimeer, Bill)
Euler, Leonard - 1707-1783. Euler was a famous Swiss physicist who was one of the most prominent mathematicians of his time, being the founder of the 'calculus of variations', the inventor of 'binary logarithms', and the third person in relatively modern times known to have advanced the theory of a hollow earth. Although he succeeded the scientists Halley and Mather, Euler was the first theorist to imagine the earth as w hollow globe devoid of additional "concentric spheres" as Symmes theorized, and theorized that the go-concavitic interior of the earth contained a single interior "sun" or luminescent orb at the exact center -- some believing this to be a focal-point of auroral or electro-magnetic energies -- which is now the most widely accepted of all 'Hollow Earth' theories today.
Evans, Hilary - UFO'S: THE GREATEST MYSTERY., Chartwell Books, Hong Kong., 1979; pp. 82-83: The Hollow Earth theory and the idea that UFOs originate from a subterranean world. German UFOlogist August Worner's belief that UFOs come from bases deep below the earth's surface, many of them emerging from beneath the mountains of Tibet.
Evans, Hilary & Michael Piccin. UFO ABDUCTION IN FRANCE - WHO TOOK WHO FOR A RIDE? Article in FATE magazine, Oct. 1982; pp. 51-58 (pp. 56-57 esp.): Describes the "Cergy-Pontaise" abduction case in Pontaise, France, and Jean-Pierre Prevost's tour of an underground UFO base at Bourg-de-Sirod in the Jura mountains, inhabited by aliens calling themselves the "Intelligences from Beyond." He observed their craft and installations within the mountains, and the tunnel-entrance to the base which is protected by an "illusionary rock-like screen."
Evans, John - ARE THERE SUPERMEN IN A LOST WORLD? Article in WEEKEND (British periodical), May 19-25 1982. p. 7: Hitler's belief in a super race living beneath the earth, based on E. Bulwer Lytton's book THE COMING RACE. Also, other related subjects which appear in THE LOST WORLD OF AGHARTI, by Alec MacLellan.
Everett, Eldon E. - THE DUPUIS PAPERS. Article in SHAVERTRON news-magazine (see: http://www.shavertron.com ), issue No. 2: Reports on the discovery of unexplored tunnels beneath the city of Tacoma, Washington as it appeared in a 1400-word-document titled "THE MYSTERIOUS CHINESE CAVES" - filed with the Washington State Historical Society.
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FAIL TO EXPLORE HAUNTED MINE - Article in THE NEW YORK HERALD., Jan. 4 1902; p. 8;  reprinted with comments of Gary Mangiacobra & Lucius Farish in THE HOLLOW HASSLE newsletter, May 1981: A strange and ancient "mine" near Alpine, Texas, from which strange forces and phenomena have resisted all efforts of exploration.
FANTASTIC Magazine - July 1956 ('Shaver Mystery' issue): Stories by Richard S. Shaver, and material both for and against Shaver's contention that the earth is hollow, and containing vast caverns and two warring races of subterranean beings descended from the ancients, the good "Tero's" and the evil "Dero's".
Farish, Lucius - SECRETS OF THE OLD ONES: CONTACT ON MOUNT SHASTA - Article in ANCIENT ASTRONAUTS magazine, May 1977: One man's contact with the "Old Ones" - an ancient of technologically advanced humans who live in underground cities 30 miles beneath the earth's surface.
Farmer, Doland - SUBTERRANEAN SASQUATCH IN THE SHAWANGUNKS. Article reprinted in THE HOLLOW HASSLE newsletter, May 1982: The origin of Bigfoot from a subterranean world.
FAR OUT magazine., April 1982 - Article: BOTTOMLESS PIT FOUND ON THE OCEAN'S FLOOR: Huge openings in the ocean floor between Panama and the Gilapagos islands, which scientists say recieve a constant flow of ocean water which is being sucked through the hole and into the crust beneath the ocean floor.
FATE Magazine
   --- July, 1954. pp. 7-8: Discovery of an ancient tunnel system 8,500 feet below the surface of the earth, broken into and explored by miners in the Lion Coal Corporation's Wattis Mine in Wattis, Utah.
   --- Nov. 1954. p. 52:  A French Jesuit priest, while exploring a subterranean lake in the San Pedro Cavern in Mt. Illampu (just east of Lake Titicaca in Bolivia-Peru) finds a tunnel-trail underground which is barred by an enormous gate of wrought iron which he cannot penetrate.
   --- Sept. 1956. pp. 8-9: Alfred Scadding of Toronto, Ontario, Canada, the sole survivor of the famous 1936 Moose River Mine disaster, confesses to George Bryant of the TORONTO DAILY STAR, that just minutes before the cave-in, he saw strange lights and heard the sounds of "shouting and laughter, as of 'little people' having fun ... like children playing in the distance."
   --- Jan. 1957. p. 10: Report on a 145-foot-deep hole drilled on the property of Mr. and Mrs. Earl Meeks, seven miles from Douglas, Georgia, through which a constant flow of air was mysteriously drawn inward and sounds resembling "something like an underground railway" were heard. Sometimes the sounds were so loud that the Meeks covered the opening with planks so it would not keep them awake at night.
   --- Nov. 1958. p. 71: The mysterious disappearance of two young workers in a coal mine three miles east of Pikeville, Kentucky.
   --- Jan. 1975: An ancient satin-smooth black silo or crescent-shaped shaft, apparently man-made, is discovered within a cave in the Mt. Tetra region of Czechoslovakia.
   --- April, 1979: Underground sanctuaries with connecting passageways near St. Augustin, Columbia, containing the statues of 300 stone giants, stone jaguars guarding underground temple entrances, and stone-lined tunnels. Believed to be an entrance to the Inner Earth, this complex is located at the headwaters of the Rio Magdalena river.
Fawcett, Brian - RUINS IN THE SKY., Hutchinson Co., London 1958: The Miraculous Grotto of Lapa (Brazil?), the largest known at the time, being a series of interconnected caves with chapels and shrines.
Fawcett. Percy H. - LOST TRAILS, LOST CITIES; Funk & Wagnells Co., NY. pp. 5-13: Records Francisco Raposo's discovery in 1743 of a lost city west of Brazil's Sao Francisco river, near the Roncador Mountains, where his party found great chasms so deep that when rocks were dropped into them "not a sound came up to indicate bottom..." This region near the Xingu river was reportedly Fawcett's destination before his disappearance.
Fesandie, Clement - THROUGH THE EARTH; 1898. 237 p., reprinted by Health Research: An occult novel, based on certain legends and stories, dealing with the earth's interior.
Fields, Ralph B. - INSIDE MOUNT LASSEN. Article in AMAZING STORIES magazine, Dec. 1946: The writer's discovery of a tunnel leading into the interior of Mt. Lassen, California, in which he and his friend encountered a strange race of humans who resided within the interior of the earth, and who traveled through the earth on strange electronic machines left by the 'old ones' and resembling sled-like conveyances which hovered inches above the smooth stone underground 'road'.
Firdausi - SHAH NAMEH (THE BOOK OF KINGS); the pre-koranic 'bible' of the Persian nation.  Refers to the epic hero, Rustam, who is said to have entered the heart of the Qaf mountains to vanquish a race of Giants. Also speaks of the legendary abode of the 'Jinns' (Jinnestans), Peries (fairies) and Deevs (giants), who are said to be "dispersed through the earth" as well.
Firestone, Clark - THE COASTS OF ILLUSION; Harper & Bros., New York 1924: The rediscovery of an old lost Russian manuscript in the 1920's which records the journey of the Samoyeds, an old Siberian tribe, to an underground cavern-city.
Fitch, Theodore
   --- "Our Paradise Inside the Earth" - Chapter in THE SUBTERRANEAN WORLD, ed. by Timothy Green Beckley., Gray Barker Books. Biblical evidence for a hollow earth.
Flammonde, Paris - THE AGE OF FLYING SAUCERS; Hawthorne Books, NY. 1971. pp. 135-137: Quotes lengthily from Ray Palmer in FLYING SAUCERS magazine, Dec. 1959, in which he argues his theories about the Hollow Earth and hidden polar openings, including the account of Admiral Byrd's sighting of "lands beyond the pole". On p. 137 we read how Dr. George Marlo invites Gray Barker and several show business celebrities to take a trip by flying saucer to a colony in South America where Dr. Raymond Bernard planned to escape an atomic war and explore tunnel entrances to the Inner Earth (The promised trip was 'cancelled' at the last minute).
FLOATING ISLANDS; Article in FATE magazine, May 1962. pp. 21-22. The discovery of 'floating islands' of ice covered with rocks, earth, plants and even small silt-floored lakes in the Arctic ocean. Evidence suggests that musk oxen, lemmings and other continental animals have roamed these mysterious islands. This may explain such oddities as Peary's report of 'Crocker land' in 1908; a similar report by Dr. Cook in 1908, and the discovery of Takpuk island in the Beaufort Sea, which Eskimos found and photographed in 1931, but which was never seen again.
FLYING ROLL [Journal of the Borderland Sciences Research Foundation - B.S.R.F. Formerly the Borderland Sciences Research Association, directed by Meade Layne later directed by Riley H. Crabb., circa 1945-1946: Some issues contain Inner Earth material.
Flynn, George - SHE'S 80 AND ON THE TRAIL OF BIGFOOT; Article in THE SAN DIEGO UNION., Aug. 17, 1982: Bigfoot investigator Virginia Louise Swanson's theories concerning the origin of Bigfoot in a series of caverns near the Santa Ysabel Indian reservation in California. She believes that these Sasquatch follow an underground river and cavern which stretches down through the state of California. (Also see: Louise, Virginia)
Fodirm, Nandor - KIDNAPED BY FAIRIES; Article in FATE magazine, July 1956 issue, pp. 82-87: Scottish and Irish accounts of people who were taken underground into "Fairyland."
Folinsbee, J.P.
   --- THE PHANTOM OF BUCK HILL CAVES., Article in CORONET magazine., June 1951. (Also see: Smith, Warren - INTO THE STRANGE)
   --- THE PHANTOM OF BUCK HILL CAVE, VIRGINIA (VA.) - Book. (Also see: Smith, Warren - INTO THE STRANGE)
   --- Vol. 20., 1909. Folklore Society. Pp. 331-332, 398: An ancient tunnel in the Fjeld Kalken mountain, near Yulevolden, Norway which, according to rumors, runs entirely through the mountain, although noone is known to have dared to traverse its entire length. Also the story of a secret cavern in the same area that was once said to be inhabited by "underground folk" - both the cavern and tunnel are said to be closed by ancient, iron gates.
   --- Vol. 28., pp. 92-93: A cave in the foothills of the Partry mountains, 12 miles east of Westport, Ireland (through which runs  a tributary of the river Aille), and within this cavern strange occurrences have taken place.
FOLLOW ME TO THE CENTER OF THE EARTH., Article in OUT OF THIS WORLD magazine., Vol. 33., reprinted in THE HOLLOW HASSLE newsletter, Vol. 1, No. 1: The Hollow Earth Mystery, and several of its early pioneer theorists are mentioned.
Folsom, Franklin - EXPLORING AMERICAN CAVES; pp. 203-204: A strange cave between Fredericksburg and Mason, Texas, called "Kiser Cave" - which, according to reports, pours out a steady stream of carbon dioxide from its mouth for no known reason. Pp. 206-207: The author also speculates that some day archeologists may discover in the U.S. or northern Mexico the entrance to the seven legendary caverns of the Aztecs... caverns far to the north of their territory in pre-Spanish Mexico, which, according to native beliefs, was the place of emergence of the ancestors of the Aztec Indian nation from the ancient subterranean world composed of the seven immense caverns. (see also: Marches, Charles A., & Brinton, D.)
Forman, Harrison - I SEE THE KING OF HELL., Article in HARPER'S magazine.,  Dec.  1934., Reprinted by Flagstaff Press, Inc., NY., Appears also in THE HIDDEN CITY OF CHIHUATLAN, by Charles A. Marches.
Fowler, Raymond E.
   --- THE ANDREASSON AFFAIR., Prentice-Hall, Englewood Cliffs, NJ., 1979: Betty Andreasson's abduction by a UFO and her visit to two subterranean worlds, one red and one green, inhabited by strange creatures, and of her witnessing something that seemed to be the re-birth of an actual (legendary!?) "Phoenix" bird.
   --- THE ANDREASSON AFFAIR, PHASE II., Prentice-Hall, Englewood Cliffs, NJ., 1982: 278 pp., Chapters 6-8: Betty Andreasson's encounter at the age of 12 with a strange "little man" who emerged from a hole in a mountain near Westminster,  England; and of a ride in a UFO - experienced later in life - to a huge cavern in which she saw a strange crystal "museum of time" and underground mountains, valleys, and enormous 'icicles'.
Fox, William S. - GREEK AND ROMAN MYTHOLOGY; p. 143: Several caverns which, according to the ancient Greeks, were entrances leading to the underworld, including the caverns at Tainaron in Lakonia, at Trozien in Argolis, at Ephya in Thesprotia, at Herakleia in Pontos, and Hermione in  Argals.
Freund, Philip - MYTHS OF CREATION; pp. 131-132: Belief of the natives of the Malinowski's Trobriand Islands that their ancestors emerged from a subterranean existence through a cavernous hole called "Obukula" near the island village of  Laba'i.
Frederick, Christof - SECRET NAZI POLAR EXPEDITIONS; Samisdat Publications.