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  1. Economic effects of controls on nitrogen fertilizer / E.R. Swanson, C.R. Taylor, and P.J. Van Blokland.
    By: Swanson, E. R. - Taylor, C. R. - Van Blokland, P. J.
    Publication info: Urbana :Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign,1978.
    Contributed by: University of Illinois Urbana Champaign
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