Meek, F. B.; Worthen, A. H. (1870). Descriptions of new species and genera of fossils from the Palaeozoic rocks of the western states. Proceedings of the Academy of Natural Sciences of Philadelphia. 22: 22-56.
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Meek, F. B.; Worthen, A. H.
1870
Descriptions of new species and genera of fossils from the Palaeozoic rocks of the western states
Proceedings of the Academy of Natural Sciences of Philadelphia