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1265618
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Western History Subject Index
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Denver Public Library
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Black diamond coal mine, Boulder ca. Colorado
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Black diamond coal mine, Boulder ca. Colorado. Estimated output daily. Republican 1881 Quality of coal. 0
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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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Black diamond coal mine, Boulder ca. Colorado
, [58516]. Denver Public Library Digital Collections, accessed 24/01/2026, https://digital.denverlibrary.org/nodes/view/1265618
