Calumet and Hecla Consolidated Copper Company & Vivian, H. (1931). Deep mining methods, Conglomerate mine of Calumet and Hecla Consolidated Copper Company. [publisher not identified].
Chicago Style (17th ed.) CitationCalumet and Hecla Consolidated Copper Company and Harry Vivian. Deep Mining Methods, Conglomerate Mine of Calumet and Hecla Consolidated Copper Company. Washington, D.C.: [publisher not identified], 1931.
MLA (9th ed.) CitationCalumet and Hecla Consolidated Copper Company and Harry Vivian. Deep Mining Methods, Conglomerate Mine of Calumet and Hecla Consolidated Copper Company. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.