Hartman, J.H. (1998). The stratigraphy of Mesozoic and early Cenozoic nonmarine mollusks of Colorado. Proceedings of the Denver Museum of Natural History. 3(14): 1-15.
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Hartman, J.H.
1998
The stratigraphy of Mesozoic and early Cenozoic nonmarine mollusks of Colorado
Proceedings of the Denver Museum of Natural History