Mahl Memoir, CPH 26, C-1, CPH 27, B-11, CPH 26, C-13.
Mahl to CPH, Oct. 30, 1883, CPH Papers, ser. 1, r. 33.
Mahl Memoir, Colonel Samuel Gill, SG-5, SG-6, SG-7 (quote), SG-21, SG-22.
Mahl Memoir, CPH 26, C-1, CPH 27, B-11, CPH 26, C-13, Mahl Papers.
Mahl Memoir, CPH 32-33, F-5, F-6, Harriman - Southern Pacific S-1, E. H. Harriman, R-1, R-2, R-3, Harriman - Characteristics, W-1, Mahl Papers.
Diagram no. 1, Southern Pacific Lines - Pacific System - Tonnage and rates per Ton-mile, 1885-1896, box 2E463, Mahl Papers.
Mahl Memoir, Southern Pacific Co., F-15, CPH, B-11, B-12, Mahl Papers.