CPH to Mills, Jan. 9, 1892, Jan. 11, 1892, CPH Papers, ser. 1, r. 50.
Mahl, Memoirs, Southern Pacific Co., F-1, Mahl Papers.
Mahl, Memoirs, Southern Pacific Co., F-1, Mahl Papers.
Stuart Daggett, Chapters on the History of the Southern Pacific (New York: A. M. Kelley, 1966, orig. ed. 1922), 136-38.
Mahl, Memoirs: P.I. Co., G18, Mahl Papers.
C. E. Bretherton to I. E. Requa, May 16, 1894 CPH Papers, ser. 1, r. 53.
CPH to Gates, May 8, 1890 CPH Papers, ser. 1, r. 48.