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1734935
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Western History Subject Index
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Denver Public Library
Digital Collections
Tunnels. Mining
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Tunnels. Mining Longest coal mining tunnel ever drilled is at Columbia Coal Mine, Utah. Cervi's Journal S 3, 1958 p 36
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Western History Subject Index
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Western History Subject Index Abbreviations
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eng
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Tunnels. Mining
, [613522]. Denver Public Library Digital Collections, accessed 20/01/2026, https://digital.denverlibrary.org/nodes/view/1734935
