Hecla Mining Company & Zeigler, W. L. (1932). Milling methods and costs at lead concentrator of Hecla Mining Company, Gem, Idaho. [publisher not identified].
Chicago Style (17th ed.) CitationHecla Mining Company and W. L. Zeigler. Milling Methods and Costs at Lead Concentrator of Hecla Mining Company, Gem, Idaho. Washington, D.C.: [publisher not identified], 1932.
MLA (9th ed.) CitationHecla Mining Company and W. L. Zeigler. Milling Methods and Costs at Lead Concentrator of Hecla Mining Company, Gem, Idaho. [publisher not identified], 1932.
Warning: These citations may not always be 100% accurate.