Engels Copper Mining Co & Nelson, W. I. (1930). Mining methods and costs at Engels mine, Plumas County, Calif. [publisher not identified].
Chicago Style (17th ed.) CitationEngels Copper Mining Co and W. I. Nelson. Mining Methods and Costs at Engels Mine, Plumas County, Calif. Washington, D.C.: [publisher not identified], 1930.
MLA (9th ed.) CitationEngels Copper Mining Co and W. I. Nelson. Mining Methods and Costs at Engels Mine, Plumas County, Calif. [publisher not identified], 1930.
Warning: These citations may not always be 100% accurate.