Western Butterflies, 50th Anniversary Edition (Roger Tory Peterson Field Guides)

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. Peterson died in 1996.