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1
由 Parham, Tommie Lee
[Washington, D.C.?] : United States Department of Agriculture, Soil Conservation Service, 1993
[Washington, D.C.?] : United States Department of Agriculture, Soil Conservation Service, 1993
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2
由 Sellnow, Steven L.
[Washington, D.C.?] : The Service, 1985
[Washington, D.C.?] : The Service, 1985
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3
由 Hill, Robert A., 1953-
[Washington, D.C.?] : The Service, 1986
[Washington, D.C.?] : The Service, 1986
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4
[Washington, D.C.] : U.S. Department of Agriculture, Agricultural Research Administration Bureau of Plant Industry, Soils, and Agricultural Engineering and Soil Conservation Service, 1950
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