United States. Bureau of Mines. (1941). Mining practices and safety at Lava Cap Gold Mining Corporation mines, Nevada City-Grass Valley district, Calif. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Mining Practices and Safety at Lava Cap Gold Mining Corporation Mines, Nevada City-Grass Valley District, Calif. [Washington]: [s.n.], 1941.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Mining Practices and Safety at Lava Cap Gold Mining Corporation Mines, Nevada City-Grass Valley District, Calif. [s.n.], 1941.
Warning: These citations may not always be 100% accurate.