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Olson, K.R., Lang, J.M., Garcia-Paredes, J.D., Majchrzak, R.N., Hadley, C.I., Woolery, M.E. and Rejesus, R.M. (2000) Average Crop, Pasture and Forestry Productivity Ratings for Illinois Soils. Bulletin 810, University of Illinois, ACES, Urbana-Champaign, Urbana.

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