Summary of phosphorus research in United States, relating to soils and fertilizers [with Subject index of major publications of State agricultural experiment stations and Federal agencies concerned with research problems relating to soils and fertilizers 1935-50]; prepared by National Phosphorus Research Work Group, W. H. Pierre, A. R. Midgley, Robert Gardner, C. Dale Hoover, L. A. Dean, Howard T. Rogers, Roscoe E. Bell.

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