Handbook of mining in the Lake Superior region. - American Institute of Mining, Metallurgical, and Petroleum Engineers; Winchell, Alexander Newton, 1874-1958.; Engineers' Club of Northern Minnesota; Duluth Engineers' Club. ([Minneapolis, Press of Byron & Learned company, 1920)
Keywords: Mines and mineral resources -- Superior, Lake; Iron mines and mining -- Superior, Lake; Copper mines and mining -- Superior, Lake