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Geological Survey (U.S.), issuing body
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Portage Lake Volcanics (Mich)

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1.
Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan
Author
Cannon, William F.
Published
[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1992.
[Washington, D.C.] : United States Government Printing Office
Online
http://purl.fdlp.gov/GPO/gpo70339
Location
Yale Internet Resource >> None
Format
Books / Online
2.
The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan
Author
Huber, N. King (Norman King), 1926-
Published
Washington : United States Department of the Interior, Geological Survey, 1973.
Online
http://purl.fdlp.gov/GPO/gpo88569
Location
Yale Internet Resource >> None
Format
Books / Online