Texas Parks and Wildlife: Endangered and Threatened Species - Houston Toad
http://www.tpwd.state.tx.us/nature/endang/htoad.htm

U.S. Fish & Wildlife Service: Environmental Contaminants Web Site
http://www.fws.gov/r9dec/

University of Texas: Herps of Texas - Bufo houstonensis
http://www.zo.utexas.edu/research/txherps/frogs/bufo.houstonensis.html

FrogWeb: Focus on Amphibian Declines and Deformities
http://www.frogweb.gov/index.html

Declining Amphibian Populations Task Force
http://www2.open.ac.uk/Ecology/J_Baker/JBtxt.htm

Center for North American Amphibians and Reptiles
http://eagle.cc.ukans.edu/~cnaar/CNAARHomePage.html

North American Amphibian Monitoring Program
http://www.im.nbs.gov/amphibs.html

Minnesota Pollution Control Agency: Deformed Frog Information
http://www.pca.state.mn.us/hot/frog-latest.html