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Installation of a model man cage at the Avoca Shaft of the Heidelberg Coal Co., Avoca, Lucerne County, Pa.

Published Year

• 1940-1949 (1)

Subject

• Coal mines and mining--Pennsylvania--Safety measures (1)
• Mine safety (1) *

Author

• Mather, Joseph V. (1)
• McCleary, E. H. (1) *

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