Useful
links:
www.caves.org
is the National
Speleological Society, the national organization of cavers.
www.cavehistory.com is
a
relatively new site about cave history. It is not associated
with
the American Spelean History Association. (As of January, 2008, the site appears to be incomplete and inactive).
www.cavern.com
is the National
Caves Association, a trade group that includes most of the commercial
caves in the United States.
www.bluegrassgrotto.org/floyd-c.html
is a Web page dedicated to Floyd Collins, the explorer who died in Sand
Cave (Kentucky) in 1925 after being trapped for several days.