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Typical bolted roof
Arthur Lakes Library Russell L. and Lyn Wood Mining History Archive United States. Bureau of Mines
Arthur Lakes Library
Russell L. and Lyn Wood Mining History Archive
United States. Bureau of Mines
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Date
1940?-1949?
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[Typical bolted roof].
JPEG, 326.31 KB
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Abstract
Mine ties bolted to roof and a ventilation tube are shown underground at an unidentified mine.
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