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2Published 1971Government Document Book
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3by Smedes, Harry W. (Harry Wynn), 1926-Subjects: “...Geology Montana Elkhorn Mountains....”
Published 1966
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4Published 1995Government Document Map
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5by Du Bray, E. A.“...Lake Cretaceous intrusive rocks, central Big Belt Mountains, Montana...”
Published 2002
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6Subjects: “...Rocks Montana Big Belt Mountains Analysis....”
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