Geology of the Lewistown coal field, Montana Calvert, William R. creator text dcu Washington Government Printing Office 1909 monographic eng
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83 p. : ill., 5 plates (incl. 2 fold. maps) ; 23 cm. by W.R. Calvert. n-us-mt Geology Montana Coal Montana TN805.M9 C2 United States. Geological Survey. Bulletin ; 390 gs 09000437 DLC 790324 20260227111309.0 gs 09000437