A stratigraphic study of the mollusks of the Calvert and Choptank formations of southern Maryland Schoonover, Lois Margaret. creator text bibliography nyu Ithaca, N.Y Paleontological research institution 1941 monographic eng
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134 p. 12 pl., fold. tab. 25 cm. by Lois Margaret Schoonover. Vita. Thesis (Ph. D.)--Bryn Mawr college, 1940. Bibliography: p. 107-110. Mollusks, Fossil Paleontology Miocene Paleontology Maryland QE801 .K44 564.1 Bulletins of American paleontology, v. 25, no. 94B gs 41000069 U.S. Geol. survey. Library 790621 20260227111346.0 gs 41000069