Download or read book A Key to Amphibians and Reptiles of the Continental United States and Canada written by Robert Powell and published by Lawrence, Kansas : University Press of Kansas. This book was released on 1998 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dichotomous key (that is, one that gives the user only two choices at each level of morphological scrutiny), it is designed for use in college-level herpetology or vertebrate biology courses. It will be especially useful as an effective tool for teaching the principles of taxonomy and for introducing students to the systematics of amphibians and reptiles.