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This May, 1972 photo released by the National Archives, Records of the Environmental Protection Agency, shows a Mexican farm worker in a lettuce field, in Blythe, Ca. The photo is part of "The Way We Worked" , part of the Smithsonian's Museum on Main Street program ? and opens Saturday, May 17, 2014 in Angola,  Louisiana, and 270 miles away in Tunica, Mississippi. Identical exhibits also are being shown in Rhode Island, Michigan and California. (AP Photo/Charles O’Rear, National Archives, Records of the Environmental Protection Agency)

This May, 1972 photo released by the National Archives, Records of the Environmental Protection Agency, shows a Mexican farm worker in a lettuce field, in Blythe, Ca. The photo is part of "The Way We Worked" , part of the Smithsonian's Museum on Main Street program ? and opens Saturday, May 17, 2014 in Angola, Louisiana, and 270 miles away in Tunica, Mississippi. Identical exhibits also are being shown in Rhode Island, Michigan and California. (AP Photo/Charles O’Rear, National Archives, Records of the Environmental Protection Agency)

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