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JOHNSON, P. R., & NORTON, D. T. (1983). SOCIAL COST OF THE TOBACCO PROGRAM REDUX. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, Vol. 65, pp. 117–119. https://doi.org/10.2307/1240345

Johnson, P. R., Grennes, T., & Thursby, M. (1979). Trade models with differentiated products. In: Proceedings Allied Social Science Association Annual Meeting, Chicago 1978. American Journal of Agricultural Economics, 61(1), 120.

JOHNSON, P. R., GRENNES, T., & THURSBY, M. (1977). DEVALUATION, FOREIGN-TRADE CONTROLS, AND DOMESTIC WHEAT PRICES. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, 59(4), 619–627. https://doi.org/10.2307/1239389

JOHNSON, P. R. (1977). ELASTICITY OF FOREIGN DEMAND FOR UNITED-STATES AGRICULTURAL PRODUCTS. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, Vol. 59, pp. 735–736. https://doi.org/10.2307/1239403