A Field Guide to Western Birds: Field Marks of All Species Found in North America West of the 100th Meridian, with a Section on the Birds of the Hawaiian Islands (The Peterson Field Guide Series)

xxvi, 366 pp. 8vo. Green cloth, olive titles and decorations. Color and black-and-white illustrations. For more than 65 years, Peterson Field Guides have set the standard by which other field guides are measured. Comprehensive and authoritative, they are essential additions to any naturalist's bookshelf or backpack. Roger Tory Peterson, one of the world's greatest naturalists, spent his life studying, painting, and photographing birds. The Peterson Identification System has been called the greatest invention since binoculars, and the Peterson Field Guide Series is credited with helping to set the stage for the environmental movement.