English, B. C., Alt, K. F., & Heady, E. O. (1985). Potential agricultural resource use and structure under soil conservation alternatives for the future. Ames: Center for Agricultural and Rural Development. Iowa State University.
Παραπομπή Chicago StyleEnglish, Burton C., Klaus F. Alt, and Earl O. Heady. Potential Agricultural Resource Use and Structure Under Soil Conservation Alternatives for the Future. Ames: Center for Agricultural and Rural Development. Iowa State University, 1985.
Παραπομπή MLAEnglish, Burton C., Klaus F. Alt, and Earl O. Heady. Potential Agricultural Resource Use and Structure Under Soil Conservation Alternatives for the Future. Ames: Center for Agricultural and Rural Development. Iowa State University, 1985.
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