Letter from Edward Schultze to B.J. Harrington regarding purchasing mines.
Letter, 30 September 1870
Letter, 18 January 1872
Letter, 3 April 1875
Letter, January 1876
Letter, 26 May 1878
Letter from James D. Dana, 1881
Letter, May 1882
Letter, 1 March 1884
Letter, 16 September 1886