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Sohl, N. F. (1960). Archaegastropoda, Mesogastropoda and stratigraphy of the Ripley Owl Creek, and Prairie Bluff Formations. United States Geological Survey Professional Paper. 331-A: 151 pp., 18 pls.
Sohl, N. F. (1960). Archaegastropoda, Mesogastropoda and stratigraphy of the Ripley Owl Creek, and Prairie Bluff Formations. United States Geological Survey Professional Paper. 331-A: 151 pp., 18 pls.
