Fieldbook of Illinois mammals Hoffmeister, Donald Frederick, 1916- creator Mohr, Carl Otto, 1902- contributor text book Urbana Natural History Survey Division 1957 1957
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ENG Illinois Mammals Manual (Illinois. Natural History Survey Division), 4 https://www.biodiversitylibrary.org/bibliography/15196 1455571 10.5962/bhl.title.15196