"Politica agraria - Modelli matematici." . . "Agrarpolitik." . . . . "Politique agricole Modèles mathématiques." . . "Politique agricole - Modèles mathématiques." . "Agricoltura Piani di produzione Stati Uniti Modelli matematici." . . "Agricultura- Aspecto económico- Estados Unidos." . . "Mathematisches Modell." . . "Center for Agricultural and Rural Development (Iowa)" . . "Srivastava, U.K." . . "Srivastava, U. K." . . . . . . . . . . . . . . . . . . . "Prototype model of regional production adjustment; Land qualities and crop production capacity; Aggregate effects of government policies; Capacity, interregional adjustment and land use; Adjustment in crop and livestock production; A model incorporating farm-size and land classes; Trade-offs in farm policy; Farm policy, and rural income and employment models; Water demand, land use, and farm policy models; Environmental quality and land and water use; Quadratic programming os spatial equilibrium; A national grain transportation model." . . . . . "Spatial sector programming models in agriculture : (by) earl O. Heady (and) uma K. Srivastava" . "Spatial sector programming models in agriculture"@en . "Spatial sector programming models in agriculture" . . . . . . . . . . . "Política agraria- Estados Unidos." . .