A nonmarine pelecypod assemblage in the Pennsylvanian of Arizona and its correlation with a horizon in Pennsylvania
Eagar, R.M.C., and Peirce, H.W., 1993, A nonmarine pelecypod assemblage in the Pennsylvanian of Arizona and its correlation with a horizon in Pennsylvania: Journal of Paleontology, v. 67, no. 1, p. 61-70.