Solem, A.; Yochelson, E.L. (1979). North American Paleozoic land snails, with a summary of other Paleozoic nonmarine snails. United States Geological Survey Professional Paper. 1072: 1-42.
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Solem, A.; Yochelson, E.L.
1979
North American Paleozoic land snails, with a summary of other Paleozoic nonmarine snails
United States Geological Survey Professional Paper