Perkins to Forbes, June 30, 1880, J. M. Forbes, In-letters, private from C. E. Perkins, 3 F 3.2-3.3, CB&Q.
for Chicago, Grodinsky, Transcontinental Strategy, 194-95.
CPH to Crocker, Dec. 8, 1881, CPH Papers, vol. 29, ser. 2, r. 6.
Adams to C. F. Morse, April 16, 1885 UP, PO, OC, vol. 28, ser. 2, r. 24.
for the Huntington system, Grodinsky, , 163-65.
CPH to Crocker, March 14, 1883, CPH Papers, vol. 30: 49-50, ser. 2, r. 6.
Klein, Jay Gould, 250, 258-59, 269-71.
note by Timothy Hopkins on letter, Personal and Confidential, CPH to Colonel Thos A. Scott, May 25, 1877, vol. 9: 185, box 24, Hopkins Collection.
CPH to Crocker, May 3, 1882, CPH Papers, vol. 29, ser. 2, r. 6.
CPH to Stanford, April 5, 1880, CPH Papers, vol. 27, ser. 2, r. 6.