Descriptions of new organic remains from the Tertiary, Cretaceous, and Jurassic rocks of Nebraskav. 12Academy of Natural Sciences175–185
Meek, F. B. and 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.