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MLA

Ash, Mark S, et al. "Regional Crop Yield Response for U.s. Grains." , 43. Print

APA

Ash, M. S, Lin, W., United States, U. States, Department of Agriculture, D. of Agriculture, & Economic Research Service, E. Research Service. (1987). Regional crop yield response for U.S. grains.

Chicago

Ash, Mark S., William Lin, United States, Department of Agriculture, and Economic Research Service. "Regional crop yield response for U.S. grains" (0000): 43.