View & Vote: Green American Heroes - Planet Green - Games & Quizzes
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Credits: Frances Beinecke/Getty Images | Library of Congress Prints and Photographs Division | U.S. Fish and Wildlife Service | Thoreau Society Collections at the Thoreau Institute | AP Photo/Susan Walsh | AP Photo/Adam Rountree | hawtaction.com | wilderness.net | Joe Munroe/Hulton Archive/Getty Images | Harry Scull Jr./Getty Images

 
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