Boulder valley mine. Boulder county, Colorado Coal. R.M. News. July 14,1880.p.2 c.1 Coal, value per ton. R. M. News . Nov. 28, 1882 p.5 c.1 Accident. R.M.Fews. Jan. 1, 1878 p.6 c.5 Approximate cost of raining and handling coal. R.M.News: Jan: 30, 1878 p.4 6.3 Heavy coal production. R.M.News. Dec. 25, 1885 p.13 c.1 " RKM 0
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