01320cam a22003131a 4500 gs 06000023 DLC 20260227111303.0 760927s1891 mnuab b s000 0 eng c gs 06000023 (OCoLC)2466199 U.S.Geol. Survey. Library. TxEU MnHi DLC premarc n-us-mn QE127 .A22 no. 6 TN403.M6 W6 Copy 2. Winchell, N. H. (Newton Horace), 1839-1914. The iron ores of Minnesota : their geology, discovery, development, qualities, and origin, and comparison with those of other iron districts / by N.H. Winchell and H.V. Winchell. Minneapolis : Harrison & Smith, state printers, 1891. ix, 430 p., 41, [1] leaves of plates : ill., maps ; 24 cm. Bulletin / Geological and Natural History Survey of Minnesota ; no. 6 Maps and plan in pockets. "Bibliography of the origin of iron ores": p. [258]-334. Iron ores Minnesota. Iron mines and mining Minnesota History. Iron ores Bibliography. Winchell, Horace V. (Horace Vaughn), 1865-1923. Bulletin (Geological and Natural History Survey of Minnesota) ; no. 6. 24376 24376