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Key, Nigel David, et al. "The Changing Economics of U.s. Hog Production." ,

APA

Key, N. David, McBride, W. D, United States, U. States, Department of Agriculture, D. of Agriculture, & Economic Research Service, E. Research Service. (2007). The changing economics of U.S. hog production.

Chicago

Key, Nigel David., William D McBride, United States, Department of Agriculture, and Economic Research Service. "The changing economics of U.S. hog production" (2007):