Soil conservation - United States. Department of Agriculture; Ladd, Judith E.; United States. Soil Conservation Service; United States. Bureau of Plant Industry, Soilsand Agricultural Engineering; United States. Agricultural Research Service. Soil and Water Conservation Research Division (Washington, D.C. : U.S. Department.of Agriculture, 1978)
Library has vol. 44
Keywords: Soil conservation -- United States; Water conservation -- United States