For more information...

Amphibian species of the world
http://research.amnh.org/vz/herpetology/amphibia/index.php

Amphibian web
http://amphibiaweb.org//aw/about/index.html

Herpetological collections databases
http://www.herpnet.org/

Partners in Amphibian and Reptile Conservation
http://www.parcplace.org/about.html

Pennsylvania Herpetological Atlas
http://www.paherpatlas.org/

Reptile species of the world
http://www.reptile-database.org/

The Center for North American Herpetology
http://www.cnah.org/index.asp

Turtles of the world
http://emys.geo.orst.edu/default.html