CPH to Hopkins, Feb. 27, 1873, LB, 3:141, box 21, Hopkins Collection.
CPH to Stanford, Feb. 28, 1873, LB, 3:147, box 21, Hopkins Collection.
For break with the Crockers, Hopkins to CPH, Oct. 16, 1870, LB, 1:160-61, box 20, CPH to Hopkins, May 2, 1871, LB, 1:177, box 20, Hopkins Collection.
CPH to Hopkins, March 17, May 2, 1871, CPH to Stanford, June 6, 1871, Huntington Letters, 3:264, 271, 281.
CPH to Hopkins, March 10, 1873, LB, 4:3, March 17, 1873, LB, 4:21, box 21, Hopkins Collection.
Pletcher, Rails, Mines, and Progress, 67-69, 91.
W. to Plumb, April 15, 1873, box 2, f. 23; newspapers, Plumb to James Mackie, Oct. 12, 1873, box 2, f. 23, Edward L.; El congreso de la Union . . . Nov. 12, 1873, box 3, f. 25, Plumb to Hurlbert, Nov. 22, 1873, box 3, f. 25; Plumb to P. H. Sheridan, March 31, 1874, box 3, f. 26, all in Plumb Papers.