	Authors	Year	Title
	Miller & Furnish	1940c	Permian ammonoids of the Guadalupe Mountain Region and adjacent areas. Special Papers of the Geological Society of America, 26: 1-242, fig.1-59, pl.1-44; Baltimore.
	Miller & Furnish	1957c	Ammonoids from the basal Word Formation, Glass Mountains, West Texas. Journal of Paleontology, 31 (6): 1052-1056, fig.1-2; Tulsa,Oklahoma.