"Storage of explosives in underground mines of the Lake Superior District."; "Cash, Frank E. (Frank Errette)"; "Iron mines and mining--Wisconsin.", "Iron mines and mining--Michigan.", "Mine explosives.", "Iron mines and mining--Minnesota."; "Cash, Frank E. (Frank Errette)"; "1946"; "

Serial issue. Issued as: United States. Bureau of Mines. Information circular, 7343 (1946:Feb.).

"; ""; "P19467"; "pec"; "Iron mines and mining--Minnesota.", "Iron mines and mining--Wisconsin.", "Iron mines and mining--Michigan.", "Mine explosives."; "14256"; .