 | Regional location of production of major field crops at alternative demand and price levels | (1) |
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 | Regional location of production of major field crops at alternative demand and price levels, 1975 : a linear programing analysis / by Melvin D. Skold and Earl O. Heady. Skold, Melvin D. 1n Washington : U.S. Dept. of Agriculture, 1966. | |
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