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  1. 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
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