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isro_geology.pdf

URL: https://irma.nps.gov/DataStore/DownloadFile/659238?Reference=2165823

Ancillary Map Information Document

Source: Digital Geologic-GIS Map of Isle Royale National Park and Vicinity, Michigan (NPS, GRD, GRI, ISRO, ISRO digital map) adapted from a U.S. Geological Survey Miscellaneous Geologic Investigations Map by Huber (1973), Professional Paper map by Wolff and Huber (1973), and a 7.5' Topographic Quadrangles map (1996)