Illinois agronomy handbook, 1993-1994 University of Illinois at Urbana-Champaign. Cooperative Extension Service. contributor text book Urbana, Ill University of Illinois at Urbana-Champaign, College of Agriculture, Cooperative Extension Service [1992] 1992
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ENG "December 1992."--Cover p.2. Control Field crops Illinois Soils Testing Weeds Circular (University of Illinois at Urbana-Champaign. Cooperative Extension Service), 1321 https://www.biodiversitylibrary.org/bibliography/53472 28126495 10.5962/bhl.title.53472 SPI