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1
by Markley, Marco L., 1914-
[Washington] : U.S. Soil Conservation Service, 1962

Book
2
by Powley, Van R.
Washington] : [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], U.S. Soil Conservation Service ; 1969

Government Document Book
3
by Simakova, M. S.
Jerusalem : Israel Program for Scientific Translations, 1964

Book
4
by Roosevelt, Theodore, 1858-1919
New York : C. Scribner's Sons, 1910

Book