National Geologic Map Database
General Information
- Title: The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan
- Author(s): Huber, N.K.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Professional Paper 754-C [p. C1-C32]
- Larger Work: Geology of the Isle Royale National Park, Michigan
- Publication Date: 1973
- Map Scale: 1:198,297
- Cross Section: None
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