Stevens, C. H. (1962). Stratigraphic significance of Pennsylvanian brachiopods in the McCoy area, Colorado. <em>Journal of Paleontology.</em> 36(4): 617-629.[details] Available for editors
original descriptionStevens, C. H. (1962). Stratigraphic significance of Pennsylvanian brachiopods in the McCoy area, Colorado. <em>Journal of Paleontology.</em> 36(4): 617-629.[details] Available for editors