Meek, F.B.; Hayden, F.V. (1860). Systematic Catalogue, with Synonyma, &c., of Jurassic, Cretaceous and Tertiary Fossils collected in Nebraska, by the Exploring Expeditions under the command of Lieut. G. K. Warren, of U. S. Topographical Engineers. Proceedings of the Academy of Natural Sciences of Philadelphia. 12: 417-432.
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Meek, F.B.; Hayden, F.V.
1860
Systematic Catalogue, with Synonyma, &c., of Jurassic, Cretaceous and Tertiary Fossils collected in Nebraska, by the Exploring Expeditions under the command of Lieut. G. K. Warren, of U. S. Topographical Engineers
Proceedings of the Academy of Natural Sciences of Philadelphia