White, C. A.; Whitfield, R. P. (1862). Observations upon the rocks of the Mississippi Valley which have been referred to the Chemung Group of New York, together with descriptions of new species of fossils from the same horizon at Burlington, Iowa. Proceedings of the Boston Society of Natural History. 8: 289-306.
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White, C. A.; Whitfield, R. P.
1862
Observations upon the rocks of the Mississippi Valley which have been referred to the Chemung Group of New York, together with descriptions of new species of fossils from the same horizon at Burlington, Iowa
Proceedings of the Boston Society of Natural History