Geology of the Lewistown coal field, Montana /
Calvert, William R.
Geology of the Lewistown coal field, Montana / by W.R. Calvert. - Washington : Government Printing Office, 1909. - 83 p. : ill., 5 plates (incl. 2 fold. maps) ; 23 cm. - United States. Geological Survey. Bulletin ; 390 .
gs 09000437
Geology--Montana.
Coal--Montana.
TN805.M9 / C2
Geology of the Lewistown coal field, Montana / by W.R. Calvert. - Washington : Government Printing Office, 1909. - 83 p. : ill., 5 plates (incl. 2 fold. maps) ; 23 cm. - United States. Geological Survey. Bulletin ; 390 .
gs 09000437
Geology--Montana.
Coal--Montana.
TN805.M9 / C2