Adams to A. Walker, Jan. 18, 1890, UP, PO, OC, vol. 50, ser. 2, r. 45
Maury Klein, Union Pacific, vol. 1, Birth of a Railroad, 1862-1893 (Garden City, N.Y.: Doubleday, 1987), 596.
CPH to Crocker, March 14, 30, 1883 CPH Papers, vol. 30, ser. 2, r. 6.
CPH to Speyer & Co., Jan. 6, 1881, CPH Papers, vol. 74, ser. 2, r. 13.
CPH to Speyer & Co., Jan. 6, 1881, CPH Papers, vol. 13, ser. 2, r. 13.
Speyer & Co. to CPH, Dec. 15, 1883, CPH Papers, vol., ser. 1, r. 34.
Speyer & Co. to CPH, May 14, 1883, CPH Papers, ser. 1, r. 32.
Speyer Brothers to CPH, Sept. 1, 1883, CPH, ser. 1, r. 33.
CPH to Speyer & Co., Dec. 20, 30, 1882, CPH Papers, vol. 79, ser. 2, r. 13.
Speyer & Co. to CPH, Nov. 13, 1882, CPH Papers, ser. 1, r. 34.