Birds of South Dakota. Over, William H. (William Henry), 1866-1956 creator Thoms, Craig S. (Craig Sharp), 1860-1945 contributor text book Vermillion, University of South Dakota, 1920 [i.e. 1921] 1921
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ENG Birds South Dakota Bulletin (South Dakota Geological Survey) ;, 9. https://www.biodiversitylibrary.org/bibliography/55008 5052319 gs21000328 10.5962/bhl.title.55008 TxCM