Born-Digital or AnalogAnalogTranscriptBoulder valley coal mine. Erie district colorado Result of explosion. R. M. News. May 8, 1877 p.4 c.3 Lumber of men working. Description of property; rioters. R. i. News. kay 11, 1877 p.4 c.3 Supplies railroad customers, Colorado. Spy plans trouble; rioters, Black Hills. R. . News. May 29, 1877 . p.4 c.2 0CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Boulder valley coal mine. Erie district colorado, [33259]. Denver Public Library Digital Collections, accessed 09/02/2026, https://digital.denverlibrary.org/nodes/view/1191925
