Fertilizer use and crop yields in the United States / the Fertilizer Work Group, National Soil and fertilizer Research Committee, in cooperation with the Soil and Water Conservation Research Branch and the Production Economics Research Branch, Agricultural Research Service.
Washington, D.C. : U.S. Dept. of Agriculture, 1954.
Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2011. MiAaHDL
Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212 MiAaHDL
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