Meek, F. B.; Worthen, A. H. (1866). Contribution to the paleontology of Illinois and other Western States. Proceedings of the Academy of Natural Sciences of Philadelphia. 18: 251-275.
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Meek, F. B.; Worthen, A. H.
1866
Contribution to the paleontology of Illinois and other Western States
Proceedings of the Academy of Natural Sciences of Philadelphia