Robert A. Trennert, "The Southern Pacific of Mexico," Pacific Historical Review 35 (Aug. 1966): 265-66.
Mexico added some new figures to the mix, such as Albert Kingsley Owen.
Hart, Empire and Revolution, 107-15.
CPH to Crocker, May 9, 1881, CPH Papers, vol. 28, ser. 2, r. 6.
David Pletcher, Rails, Mines, and Progress.
Last spike, C. Crocker to CPH, Dec. 23, 1887, CPH Papers, ser. 1, r. 46.
for deal with Speyer, Crocker to CPH, April 14, 1887, CPH Papers, ser. 1, r. 45.
for Oregon, C. Crocker to CPH April 11, 1887, CPH to Gates, July 11, 1887, CPH Papers, ser. 1, r. 45 (CPH letters from Europe were filed with incoming correspondence).
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.
Adams to Gen. W. Swayne, May 15, 1889, UP, PO, OC, vol. 47, ser. 2, r. 42; Fred. Ames to Adams, April 30, 1885, UP, SG2, ser. 1, box 14.
Adams to Wilson, April 23, 1889, UP, PO, OC, vol. 47, ser. 2, r. 42
for opposition of O&T, Paul Edes (O&T) to Board of Northern Pacific, Jan. 14, 1886, Henry Villard Papers, Mss 8993, vol. 719, 1862-1928, box 34.