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MLA

Heimlich, Ralph E, et al. "Productivity and Erodibility of U.s. Cropland." , 21. Print

APA

Heimlich, R. E, United States, U. States, Department of Agriculture, D. of Agriculture, & Economic Research Service, E. Research Service. (1989). Productivity and erodibility of U.S. cropland.

Chicago

Heimlich, Ralph E., United States, Department of Agriculture, and Economic Research Service. "Productivity and erodibility of U.S. cropland" (1989): 21.