=A guide with illustrations or photographs for identification
First edition, two hardcover volumes in near fine condition. Vol 2 slightly cocked. Volume 1: Field Guide & Volume 2: Attributes and Status. These depict virtually all species and most distinctive subspecies and plumages, some of which appear in no other guide. Over 1,450 color maps, based primarily on verified records, represent the ranges of each regularly occurring species and many distinctive races, and distinguish migratory routes from winter ranges. Maps are annotated as to geographic variation, status, and habitat. Concise texts give the information necessary to identify each species. To assist in locating groups within the text, illustrated plate keys are provided on the endpapers.