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.
Daggett, Chapters, 136-38.
William Mahl, Memoirs: P.I. Co., G18, Mahl Papers.
Mahl, Memoirs, Southern Pacific Co., F-5, Mahl Papers.
CPH to E. Denison, June 1, 1892, CPH Papers, vol. 227, ser. 2, r. 33.