Fulton, C. V., Heady, E. O., & Ayres, G. E. (1978). Farm machinery costs in relation to machinery and farm size. Ames: Center for Agricultural and Rural Development. Iowa State University.
Παραπομπή Chicago StyleFulton, Craig V., Earl O. Heady, and George E. Ayres. Farm Machinery Costs in Relation to Machinery and Farm Size. Ames: Center for Agricultural and Rural Development. Iowa State University, 1978.
Παραπομπή MLAFulton, Craig V., Earl O. Heady, and George E. Ayres. Farm Machinery Costs in Relation to Machinery and Farm Size. Ames: Center for Agricultural and Rural Development. Iowa State University, 1978.
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