The proposed Voyageurs National Park: Its geology and mineral potential, 1969, Plate 1
Description
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of proposed Voyageurs National Park, Northern Minnesota, scale 1 inch = about 1 1/4 miles.
Minnesota Geological Survey (1969). The proposed Voyageurs National Park: Its geology and mineral potential, 1969, Plate 1. Minnesota Geological Survey. https://reflections.mndigital.org/catalog/mgs:1091 (map)