00944cam a22002891 4500 gs 13000376 DLC 20260227111314.0 790829s1913 dcuabf f001 0 eng gs 13000376 (OCoLC)5322849 DLC ICharE DLC premarc n-us-mt TN24.M9 K5 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 Some of the plates printed on both sides of leaf. "Literature": p. 18-19. Includes index. Mines and mineral resources Montana. Geology Montana. United States. Geological Survey. Bulletin ; 527. 25254 25254