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1961. 2011-05-03T17:27:54Z. 2012-02-14T00:27:06Z. Geological Survey (U.S.). The Survey. English. Public. Montana.
1961. 2012-09-12T18:20:35Z. 2013-03-18T22:18:00Z. Colton, Roger B. (Roger Burnham), 1924-. Dept. of the Interior, U.S. Geological Survey. English. Public. Montana.