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http://www.caves.org National Speleological Society
http://www.cavern.com National Caves Association
http://www.nps.gov/cave/historyculture/leg_carlsbad_cave_nm.htm
http://www.nrpa.org/admin/content/previewContent.aspx?documentId=7050
http://www.cavernsofsonora.com
http://i-s-c-a.com/
http://cavern.org/acca/aboutacca.php
http://www.nps.gov/cave/planyourvisit/upload/chu_20040831.pdf CAVE History Update: A Newsletter from CAVE Cultural Resources in the Resource Stewardship and Science Division CHU #10 — August 31, 2004. Accessed 4/21/09 9:45pm
http://www.goodearthgraphics.com/virtcave/index.html