Edited by Roger Tory Peterson
East/Central Reptiles and Amphibians Field Guide describes 595 species and subspecies found in an area east of and including Texas and the states northward through the Dakotas, as well as Manitoba and Keewatin. 1998. 634 pages.
Western Reptiles and Amphibians Field Guide covers 244 species found in the areas west of the eastern boundaries of New Mexico, Colorado, Wyoming, Montana and Saskatchewan north to the Arctic Circle. 2003. 544 pages.