Weeds of the North Central States University of Illinois at Urbana-Champaign. Agricultural Experiment Station. contributor text book Urbana, Ill University of Illinois at Urbana-Champaign, College of Agriculture, Agricultural Experiment Station [1981] 1981 [Rev. ed.]
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ENG Includes indexes. Middle west Weeds Bulletin / University of Illinois at Urbana-Champaign, College of Agriculture, Agricultural Experiment Station, 772 North Central regional publication, no.281 https://www.biodiversitylibrary.org/bibliography/45841 8162894 10.5962/bhl.title.45841 SPI