Meek, F.B.; Hayden, F.V. (1860). Descriptions of new Organic Remains from the Tertiary, Cretaceous and Jurassic Rocks of Nebraska. Proceedings of the Academy of Natural Sciences of Philadelphia. 12: 175-185.
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Meek, F.B.; Hayden, F.V.
1860
Descriptions of new Organic Remains from the Tertiary, Cretaceous and Jurassic Rocks of Nebraska
Proceedings of the Academy of Natural Sciences of Philadelphia