http://www.uri.edu/cels/nrs/paton/whatisavp.html
http://www.worldwildlife.org/wildworld/profiles/terrestrial/na/na0801_full.html
http://www.epa.gov/owow/wetlands/types/vernal.html
http://www.yale.edu/ynhti/curriculum/units/1995/5/95.05.03.x.html#h
http://www.nhaudubon.org/conservation/vernal.htm
http://www.bio.umass.edu/biology/conn.river/vernal.html
http://ceres.ca.gov/wetlands/whats_new/vernal_sjq.html
http://endeavor.des.ucdavis.edu/cnps/vernal.html
http://soli.inav.net/~arachnid/maire/vernalpools.html
http://courses.washington.edu/rarecare/RareEcos/vernalpools.htm
http://www.charteroak.net/news/article/Wetlands%20Decision%20Article.htm