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1440898
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Western History Subject Index
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Denver Public Library
Digital Collections
Helmick tunnel company
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Helmick tunnel company Activities; development, Leavenworth mt.,Georgetown district colorado mountain , 1869. p.4 c.4
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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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Helmick tunnel company
, [304864]. Denver Public Library Digital Collections, accessed 07/03/2026, https://digital.denverlibrary.org/nodes/view/1440898
