Meek, E. B. & Hayden, E. V. (1859). Remarks on the Lower Cretaceous beds of Kansas and Nebraska, together with descriptions of some new species of Carboniferous fossils from the valley of Kansas River. Proceedings of the Academy of Natural Sciences of Philadelphia. 10: 256-264 [for 1858].
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Meek, E. B. & Hayden, E. V.
1859
Remarks on the Lower Cretaceous beds of Kansas and Nebraska, together with descriptions of some new species of Carboniferous fossils from the valley of Kansas River
Proceedings of the Academy of Natural Sciences of Philadelphia