Meek, F. B. & Worthen, A. H. (1866). Descriptions of Palaeozoic fossils from the Silurian, Devonian, and Carboniferous rocks of Illinois, and other western states. Proceedings of the Chicago Academy of Sciences. 1: 11-23.
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Meek, F. B. & Worthen, A. H.
1866
Descriptions of Palaeozoic fossils from the Silurian, Devonian, and Carboniferous rocks of Illinois, and other western states