Lake Superior Mining Institute: np (Ishpeming), 1922. Hardcover. Very Good. Item #21-2609
Map, plans, illus., 9 x 6", green cloth, gilt lettering on cover, 242pp. Covers have light wear and staining, pencil note else contents very good condition. The map: "Portage Lake Mining District, Michigan College of Mine Yearbook". Some of the articles: "Handling Underground Waste Rock..." T.C. DeSollar, "The Mining Methods Of The Copper Range Company..." W.H. Schact, "A Mechanically Operated Door To Control Air Currents On Main Haulage Levels" Tom A. Miller. SCARCE.