Conrad, T. A. (1843). Observations on the lead bearing limestone of Wisconsin, and descriptions of a new genus of trilobites and fifteen new Silurian fossils. Proceedings of the Academy of Natural Sciences of Philadelphia. 1: 329-335.
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Conrad, T A
1843
Observations on the lead bearing limestone of Wisconsin, and descriptions of a new genus of trilobites and fifteen new Silurian fossils
Proceedings of the Academy of Natural Sciences of Philadelphia