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1440882
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Western History Subject Index
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Denver Public Library
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Helmer extension mine. Central City district colorado
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Helmer extension mine. Central City district colorado Owners. R. M. News. Aug. 6, 1882 p.6 c.3 Developments. R. M. News. Dec. 13, 1881 p.6 c.1
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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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Helmer extension mine. Central City district colorado
, [304842]. Denver Public Library Digital Collections, accessed 05/12/2025, https://digital.denverlibrary.org/nodes/view/1440882
