Gulch mining, Colorado Hydraulic plan, Humbug Gulch; yield, Nigger gulch activities, Mc Nulty & American gulches. R.M'News. Oct. 3, 18 0 p.2 c.1 Activities, gulches; list. R.^A News. Sept. 29, 1990 p.2 c.3 Activities, gulches; list. R.M -News. Apr. 5, 1851 p.2 c.3 activities, yield, Georgia & Humbug gulches R.M.Newp. Sept. 12. 1860 p.1 e.5
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