The anorthosytes of the Minnesota coast of Lake Superior ; The laccolitic sills of the north-west coast of Lake Superior [microform]
At head of title: Geological and natural history survey of Minnesota; bulletin no. 8 "With a prefatory note on the Norian of the northwest by N.H. Winchell." Filmed from a copy of the original publication held by the Library, Geological Survey of Canada 43
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