Changes in farm production and efficiency - Duroet, Donald D.; Black, Evelyn T.; United States. Agricultural Research Service. Production Economics Research Branch; United States. Agricultural Research Service; United States. Department of Agriculture. Economic Research Service; United States. Department of Agriculture. Economic, Statistics and Cooperatives Service; United States. Department of Agriculture (Washington, D.C. : U.S. Agricultural Research Service, Production Economics Research Branch, 1978)
Keywords: Agriculture -- United States -- Statistics; Agriculture -- Economic aspects -- United States -- Statistics; Agricultural productivity -- United States -- Statistics