Permian brachiopods of west Texas, V
Cooper, G.A., Grant, E.
Permian brachiopods of west Texas, V - Washington 1976 - 2610-3160 p. - Smithsonian Contributions to Paleobiology. No. 24 .
Permian brachiopods of west Texas, V - Washington 1976 - 2610-3160 p. - Smithsonian Contributions to Paleobiology. No. 24 .