http://speleology.cs.yale.edu/
The Speleology Home Page provides information about speleology, the sport of caving. Users will find information about the National Speleology Society, as well as other speleology organizations. Other materials include an archive of caving pictures, clip art and cartoons, as well as more serious files with software for cave mapping and surveying. Caving documents include archives of the Cavers Digest newsgroup and Caving Online newsletter regarding spelunking resources on the Internet. Users will also find a public calendar of speleological events, and information about commercial equipment retailers.