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Automatic derailing switch at Roslyn no. 3 mine, Northwestern Improvement Company, Roslyn, Wash.

Mining methods of the Holden Mine, Howe Sound Co., Chelan Division, Holden, Wash.

Manganese deposits of the Olympic Peninsula, Wash.

Published Year

• 1930-1939 (1)
• 1940-1949 (1)
• 1960-1969 (1)

Subject

• Mines and mineral resources--Washington (State) (3) *
• Manganese ores--Washington (State) (1)
• Mine safety--Washington (State) (1)

Author

• Ash, S. H. (1)
• Kudlich, Rudolf H., (1)
• Magill, E. A. (1)
• Soderberg, R. L. (1)

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