Ore deposits of the Helena mining region, Montana /
Knopf, Adolph, 1882-
Ore deposits of the Helena mining region, Montana / by Adolph Knopf. - Washington, Govt. Print. Off., 1913. - 143 p. : ill., plates, fold. maps, diagrs. ; 24 cm. - U.S. Geological survey. Bulletin 527 . - United States. Geological Survey. Bulletin ; 527. .
Some of the plates printed on both sides of leaf. "Literature": p. 18-19. Includes index.
gs 13000376
Mines and mineral resources--Montana.
Geology--Montana.
TN24.M9 / K5
Ore deposits of the Helena mining region, Montana / by Adolph Knopf. - Washington, Govt. Print. Off., 1913. - 143 p. : ill., plates, fold. maps, diagrs. ; 24 cm. - U.S. Geological survey. Bulletin 527 . - United States. Geological Survey. Bulletin ; 527. .
Some of the plates printed on both sides of leaf. "Literature": p. 18-19. Includes index.
gs 13000376
Mines and mineral resources--Montana.
Geology--Montana.
TN24.M9 / K5