Whitfield R.P. (1882). On the fauna of the Lower Carboniferous limestones of Spergen Hill, Ind., with a revision of the descriptions of its fossils hitherto published, and illustrations of the species from the original type series. Bulletin of the American Museum of Natural History. 1(5): 39-97.
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Whitfield R.P.
1882
On the fauna of the Lower Carboniferous limestones of Spergen Hill, Ind., with a revision of the descriptions of its fossils hitherto published, and illustrations of the species from the original type series
Bulletin of the American Museum of Natural History