Carboniferous of the Northern Rocky Mountains
Durtro, J. Thomas Jr.,Ernest H. Gilmour, Raymond C. Gutschick, Charles A. Sandberg, and William J. Sando
The American Geological Institure
Dutro, J. Thomas, Jr.
AGI Selected Guidebook Series No. 3, Field Trip No. 15, Ninth International Congress of Carboniferous Stratigraphy and Geology