Devonian carrier shells (Euomphalidae) from North America and Germany - Linsley, Robert M., 1930-; Yochelson, Ellis L. (Ellis Leon), 1928-2006; United States Dept. of Interior (Washington, D.C : United States Government Printing Office, 1973)
Bibliography: p. 22-23
Keywords: Euomphalidae; Xenophora; Paleontology -- Devonian; Paleontology -- North America; Paleontology -- Germany; Geology -- Germany -- Survey; Geology -- North America -- Survey