	Authors	Year	Title
	Miller & Gurley	1896	New species of Palaeozoic invertebrates from Illinois and other states. Bulletin of the Illinois State Museum of Natural History, 11: 1-50, pl.1-5; Springfield, IL.
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.