U.S. Department Of Agriculture

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U.S. Department of Agriculture Secretary Robert Bonnie, left, and Montana Gov. Steve Bullock, speak outside the Tenmile Water Treatment Plant in Helena, Mont., on Thursday, Feb. 6, 2014. Restoring the Tenmile watershed is one of 13 projects the USDA announced it would spend $30 million on this year (AP Photo/Matt Volz)

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This image from the U.S. Department of Agriculture shows a giant African snail with an albino shell. (Courtesy of the USDA)

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Sen. Susan Collins, Maine Republican, introduced the amendment to block the U.S. Department of Agriculture from limiting potatoes or other vegetables in school lunches. She cited additional costs on school districts that would result. (Associated Press)

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**FILE** This undated photo provided by the Agricultural Research Service of the U.S. Department of Agriculture shows Plum Island, a tiny island off the coast of New York's Long Island where the nation's primary animal disease laboratory is located. (Associated Press/USDA-ARS)

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** FILE ** An undated photo provided by the U.S. Department of Agriculture shows USDA official Shirley Sherrod. (AP Photo/United States Department of Agriculture)

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An undated photo provided by the U.S. Department of Agriculture shows former USDA official Shirley Sherrod, who was fired this week after brief comments she made in a March speech were taken out of context. (AP Photo/United States Department of Agriculture)