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Document, mine timber specifications

Arthur Lakes Library
; 
Russell L. and Lyn Wood Mining History Archive
; 
United States. Bureau of Mines
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Date
1900?-1999?
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Keywords
Mine timbering
 Mining
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Mining History - Images
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[Document, mine timber specifications].
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https://hdl.handle.net/11124/6761
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Abstract
B-134/750. Figure 2 Mine timber specifications. Note: Used in connection with I.C. 7459: Support of Ground, Iron-Ore mines, Lake Superior District. The Cleveland-Cliffs Iron Co., Mich.
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