Descriptions of New Species and Genera of Fossils, Collected by Dr. FV Hayden in Nebraska Territory, under the Direction of Lieut. GK Warren, US Topographical Engineer; with Some Remarks on the Tertiary and Cretaceous Formations of the North-West, and the Parallelism of the Latter with Those of Other Portions of the United States and Territories
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Descriptions of New Species and Genera of Fossils, Collected by Dr. FV Hayden in Nebraska Territory, under the Direction of Lieut. GK Warren, US Topographical Engineer; with Some Remarks on the Tertiary and Cretaceous Formations of the North-West, and the Parallelism of the Latter with Those of Other Portions of the United States and Territories