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Nature studies on the farm : soils and plants
Keffer, Charles A. (Charles Albert), 1861-1935New York : American Book Co., [c1907]Online Full text via HathiTrust
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Experimental tree planting in the plains
Keffer, Charles A. (Charles Albert), 1861-1935Washington, D.C. : Dept. of Agriculture, Forestry Division, 1898.Online Full text via HathiTrust
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