Permian brachiopods of West Texas: IV
Cooper, G.A., Grant, R.E.
Permian brachiopods of West Texas: IV - Washington 1976 - 2007 p. - No. 21; Smithsonian Contributi .
Permian brachiopods of West Texas: IV - Washington 1976 - 2007 p. - No. 21; Smithsonian Contributi .