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1. Map showing peat deposits of Itasca County, Minnesota

1919. Minnesota Geological Survey. Scale not given (W 94°25ʹ00ʺ--W 93°03ʹ00ʺ/N 47°53ʹ00ʺ--N 47°01ʹ00ʺ). "Plate IV" in upper right corner. [From Bulletin No. 16, 1919, The Peat Deposi...

2. The proposed Voyageurs National Park: Its geology and mineral potential, 1969, Plate 1

1969. Minnesota Geological Survey. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of proposed Voyageurs National Park, No...