Hartman, J.H.; Roth, B. (1998). Late Paleocene and Early Eocene Nonmarine Molluscan Faunal Change in the Bighorn Basin, Northwestern Wyoming and South-Central Montana. In: Aubrey, M.-P.; Lucas, S.G.; Berggren, W.A. (eds) Late Paleocene–Early Eocene Biotic and Climatic Events in the Marine and Terrestrial Records. Columbia University Press, pp. 323-379.
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Hartman, J.H.; Roth, B.
1998
Late Paleocene and Early Eocene Nonmarine Molluscan Faunal Change in the Bighorn Basin, Northwestern Wyoming and South-Central Montana. In: Aubrey, M.-P.; Lucas, S.G.; Berggren, W.A. (eds) Late Paleocene–Early Eocene Biotic and Climatic Events in the Marine and Terrestrial Records