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J. R. Gill & W. A. Cobban 1973. Stratigraphy and Geologic History of the Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota. U.S. Geological Survey Prof. Paper 776. iii+37 pp., 21 figs, 4 tables. Washington. Price U.S. $0.60.
Published online by Cambridge University Press: 01 May 2009
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- Copyright © Cambridge University Press 1975