Descriptions of New Cretaceous Fossils from Nebraska Territory, Collected by the Expedition Sent out by the Government under the Command of Lieut. John Mullan, US Topographical Engineers, for the Location and Construction of a Wagon Road from the Sources of the Missouri to the Pacific Oceanv. 14Academy of Natural Sciences21–28
Meek, F. B. and Hayden, F. V. 1862. "Descriptions of New Cretaceous Fossils from Nebraska Territory, Collected by the Expedition Sent out by the Government under the Command of Lieut. John Mullan, US Topographical Engineers, for the Location and Construction of a Wagon Road from the Sources of the Missouri to the Pacific Ocean." Proceedings of the Academy of Natural Sciences of Philadelphia, 14 21–28.