Walcott, C.D., 1918, Cambrian geology and paleontology IV: Appendages of trilobites: Smithsonian Miscellaneous Collections, v. 67, p. 115-216. Authors Walcott, C.D. Publication Date 1918 Citation Smithsonian Miscellaneous Collections, v. 67, p. 115-216. AzGeoBib RefNum 10748
