Welch, Philip. Historically Important Collection of Two Autograph Manuscript Letters Written by Early Gold Miners from Helena, Montana Territory, Discussing the Recent Discovery of a Ton of Gold Dust, Deep Diggings on Confederate Gulch, High Levels of Crimes, Scarcity of Water to Mining Claims, Labor on Mining Ditches, and Comparisons of Montana and California Gold Prospects. Helena, Montana Territory: 28 & 29 August 1866.