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Lower Middle Devonian proetid trilobites from Michigan, southwestern Ontario, and northern Ohio.

Bibliographic Details
Main Author:	Stumm, Erwin Charles, 1908-1969
Format:	Book
Language:	English
Published:	Ann Arbor : University of Michigan Press, 1953.
Series:	Contributions from the Museum of Paleontology ; v. 11, no. 2.
Subjects:	Proetidae. Paleontology > Devonian. Paleontology > North America.

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