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By "Runge, Edward C. A. "
Soil productivity indexes for Illinois counties and soil associations / [prepared by P. W. Mausel, E. C. A. Runge, and S. G. Carmer].
By: Mausel, P. W. - Carmer, S. G. - Runge, Edward C. A.
Publication info: Urbana :University of Illinois at Urbana-Champaign, College of Agriculture, Agricultural Experiment Station,1975.
Contributed by: University of Illinois Urbana Champaign