A Key to Amphibians and Reptiles of the Continental United States and Canada
Robert Powell teaches biology at Avila College in Kansas City, Missouri.Joseph T. Collins, coauthor of thePeterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, is the director of the Center for North American Amphibians and Reptiles in Lawrence, Kansas.Errol D. Hooper, Jr., is a freelance wildlife illustrator.