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.