A field guide to western birds : a completely new guide to field marks of all species found in North America west of the 100th meridian and north of Mexico
A field guide to the birds of western North America -- sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Tory Peterson Institute
Print Book, English, 1990
Third edition, completely revised and enlarged
Houghton Mifflin Company, Boston, 1990