Whitfield R.P. (1889). Observations on some imperfectly known fossils from the Calciferous sandrock of Lake Champlain, and descriptions of several new forms. Bulletin of the American Museum of Natural History. 2:41-63.
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Whitfield R.P.
1889
Observations on some imperfectly known fossils from the Calciferous sandrock of Lake Champlain, and descriptions of several new forms
Bulletin of the American Museum of Natural History