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1
Water use/yield relationships for central Great Plains crops : knowing and using these relationships can help you to make wise cropping decisions /
by Nielsen, David C. (David Christopher)
Akrro [Colo.] : USDA-NRCS : USDA-ARS : Colorado Conservation Tillage Association, 1995

Government Document Book
2
Soil organic matter levels in the central Great Plains /
by Bowman, Rudolph Alexander, 1941-
Akron, CO : USDA-ARS : Db USDA-ARS, 1997

Government Document Book
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