See larger In this May 1972 photo provided by the U.S. National Archives, an unidentified hitchhiker stands with his dog 'Tripper' along U.S. 66 near Topock, Ariz. The photo is part of Documerica, an EPA project during the 1970s in which the agency hired dozens of freelance photographers to capture thousands of images related to the environment and everyday life in America. Modeled after Documerica, the agency has embarked on a massive effort to collect photographs from across the United States and around the world over the next year that depict everything from nature's beauty to humanity's impact, both good and bad. (AP Photo/U.S. National Archives, Charles O'Rear)

In this May 1972 photo provided by the U.S. National Archives, an unidentified hitchhiker stands with his dog "Tripper" along U.S. 66 near Topock, Ariz. The photo is part of Documerica, an EPA project during the 1970s in which the agency hired dozens of freelance photographers to capture thousands of images related to the environment and everyday life in America. Modeled after Documerica, the agency has embarked on a massive effort to collect photographs from across the United States and around the world over the next year that depict everything from nature's beauty to humanity's impact, both good and bad. (AP Photo/U.S. National Archives, Charles O'Rear)

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