00842cam a22002531 4500 gs 07000552 DLC 20260227111306.0 761117s1906 xx 000 0 eng c gs 07000552 (OCoLC)2562772 Library, U.S. Geological Survey OGraD OCoLC DLC premarc QE187 .B8 TN424.B85 B8 Copy 2. Geological Survey of Canada Preliminary report on the Rossland, B.C., mining district, by R. W. Brock. Ottawa, Government printing bureau, 1906. 40 p. 24 cm. At head of cover-title: Geological survey of Canada. Geology British Columbia. Gold mines and mining British Columbia. Brock, Reginald Walter, 1874-1935. 24598 24598