Bird, Samuel O. 1934- A pelecypod fauna from the Gaptank Formation (Pennsylvanian) west Texas, by Samuel O. Bird. - Ithaca, N.Y., Paleontological Research Institution, 1968. - 112-185 p. illus. 23 cm. - Bulletins of American paleontology, v. 54, no. 240 . Bibliography: p. 167-173. LCCN: gs 68000132 Subjects--Topical Terms: Bivalves, Fossil--Texas.Paleontology--Pennsylvanian.Paleontology--Texas, West. LC Class. No.: QE811 / .B57 Dewey Class. No.: 564/.1