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Pre-Cambrian Rocks of the Lake Superior Region, a review of newly discovered geologic features with a revised geologic map.

Bibliographic Details
Corporate Author:	Geological Survey (U.S.)
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1935.
Subjects:	Geology. Lakes. Michigan. Wisconsin.
Online Access:	Electronic resource (PDF)

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