Walcott, C.D., 1924, Cambrian geology and paleontology V, No. 2; Cambrian and Lower Ozarkian trilobites: Smithsonian Miscellaneous Collections, v. 75, p. 53-60. Authors Walcott, C.D. Publication Date 1924 Citation Smithsonian Miscellaneous Collections, v. 75, p. 53-60. AzGeoBib RefNum 10750