![Paleontological Society]()
Paleontological SocietyR. L. Langenheim, Jr., John M. Dennison, William W. Hay, Stanley H. Frost, John S. Bradley, Geraldine Kienzlen, Thomas Ellis Williams, C. C. Albritton, Erwin C. Stumm, N. D. Newell, Roger L. Batten and W. P. Woodring · Journal of Paleontology · 1964