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Technical Information Series
A progress review of Iowa's Agricultural-energy-environmental initiatives: nitrogen management in Iowa, G. R. Hallberg, C. K. Contant, C. A. Chase, G. A. Miller, M. D. Duffy, R. J. Killorn, R. D. Voss, A. M. Blackmer, S. C. Padgitt, J. R. DeWitt, J. B. Gulliford, D. A. Lindquist, L. W. Asell, D. R. Keeney, R. D. Libra, and K. D. Rex, 1991, 29 p., 9 figs., 10 tables. 
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