Heady, E. O., & Srivastava, U. K. (1975). Spatial sector programming models in agriculture. Iowa State university.
Chicago-čujuhus (17. p.)Heady, Earl O., juo Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Ames: Iowa State university, 1975.
MLA-čujuhus (9. p.)Heady, Earl O., juo Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Iowa State university, 1975.
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