Average crop, pasture, and forestry productivity ratings for Illinois soils
Olson, K.R.; Lang, J.M.; Garcia-Paredes, J.D.; Majchrzak, R.N.; Hadley, C.I.; Woolery, M.E.; Rejesus, R.M.
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https://hdl.handle.net/2142/8646
https://hdl.handle.net/2142/8646