The genus Conotrachelus Dejean (Coleoptera, Curculionidae) in the north central United States Schoof, Herbert Frederick, 1914- creator text book Urbana The University of Illinois press 1942 1942
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ENG "The greater portion of the material included in this study has been taken from a thesis of the same title, submitted...for the degree of doctor of philosophy...University of Illinois, 1940. The original material has been revised, and several additions have been made."--Pref. Contribution from the Entomological laboratories of the University of Illinois, no. 223. Beetles Conotrachelus United States QL596.C9 S332 595.768 Illinois biological monographs, v. 19, no. 3 https://www.biodiversitylibrary.org/bibliography/50123 776564 10.5962/bhl.title.50123