Meek, F.B. (1860). Descriptions of new fossil remains collected in Nebraska and Utah, by the exploring expeditions under the command of Captain J. H. Simpson, of U. S. Topographical Engineers, [extracted from that officer's forthcoming report]. Proceedings of the Academy of Natural Sciences of Philadelphia. 12: 308-315.
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Meek, F.B.
1860
Descriptions of new fossil remains collected in Nebraska and Utah, by the exploring expeditions under the command of Captain J. H. Simpson, of U. S. Topographical Engineers, [extracted from that officer's forthcoming report]
Proceedings of the Academy of Natural Sciences of Philadelphia