The gastropod genus Yvania; contribution to the paleontology of Illinois Weller, J. Marvin (James Marvin), 1899-1976 creator text book Urbana Jeffersons printing & stationery Co.] 1929 1929
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ENG At head of title: State of Illinois. Department of registration and education. Division of the State geological survey. Gastropoda, Fossil QE105 .A25 no.18 557.73 Gastropod genus Yvania Illinois State Geological Survey Report of investigations, no. 18 https://www.biodiversitylibrary.org/bibliography/61763 4383457 10.5962/bhl.title.61763 U. S. Geol. survey. Library for Library of Congress (253) Il 5r no. 18