Ulrich, E.O., and Bassler, R.S., 1931, Cambrian bivalved Crustacea of the order Conchostraca: U.S. National Museum Proceedings, v. 78, art. 4, 130 p. Authors Ulrich, E.O., and Bassler, R.S. Publication Date 1931 Citation U.S. National Museum Proceedings, v. 78, art. 4, 130 p. State AZ Province CP TR County CN MO Keywords Paleontology Invertebrate More Keywords Paleontology, Invertebrate, AzGeoBib RefNum 10519