Butler, Charles M. (ca. 1866 – after 1930); [Hopkins, William A.] (ca. 1862-1951). Collection of Three Original Autograph Letters Signed to His Friend William Hopkins from Watsonville, CA, Talking about His Gold Mining on the Sunset Creek near Nome, the Success of the “Pioneer Mining Co.” on the Metson Bench and of Other Miners on the Ophir Creek, the Creation of a New Gold Mining Camp on the Iditarod River, and that “it is the hardest time I ever saw in Nome”. Nome, Alaska, 20 June 1909, 28 October 1909, 10 March 1910.
Pollard, F.E. Collection of Thirty Original Gelatin Silver Photos of Gold Mines and Refining Plants of the Witwatersrand Gold Fields around Johannesburg. Ca. 1900.