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Beginning with his 1934 Field Guide to the Birds, Roger Tory Peterson introduced literally millions of people to the pleasures of observing birds in the wild. His field guide, which has gone through five editions and sold more than four million copies, fostered an appreciation for the natural world that set the stage for the contemporary environmental movement. When Rachel Carson's Silent Spring sounded a warning about the threat to birds and their habitats in the 1960s, the Peterson field guides had already prepared the public and the scientific community to heed...