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MLA

Warren, Fred B, et al. "Crop Production In Niger (1973)." ,

APA

Warren, F. B, United States, U. States, Department of Agriculture, D. of Agriculture, & Agency for International Development, A. for International Development. (0000). Crop production in Niger (1973).

Chicago

Warren, Fred B., United States, Department of Agriculture, and Agency for International Development. "Crop production in Niger (1973)" (1974):