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2. Competitive land use in American forestry end agriculture;Clawson;J. For. Hist.,1981
3. Crosson, P.R. Future economic and environmental costs of agricultural land. In: The cropland crisis: myth or reality? Baltimore, MD: Resources for the future, and John Hopkins University Press, 1982.
4. Economic potential for converting woodland and pasture to cropland: Lower Mississippi valley and Southeast: USDA;Davis;Econ. Res. Service,1972
5. Commodity policy issue for the 1980s;Ericksen;South. J. Agric. Econ.,1980