The best account of western coal mining is Andrews.
David A. Wolff, Industrializing the Rockies: Growth, Competition, and Turmoil in the Coalfields of Colorado and Wyoming, 1868-1914 (Boulder: Univ. of Colorado Press, 2003), 5-6, 21-22.
For a wonderful account of coal mining and its environmental, social, and political ramifications in Colorado, see Andrews, Killing for Coal.
Despite the ICC's making passes illegal, Ingalls continued to solicit them.
Connelley, Life of Plumb, 287-88.
Charles Francis Adams, Diary, Feb. 3, 1889, pp. 32-39.
Ingalls to CPH, March 7, 1891, CPH Papers ser. 1, r. 49.
Hadley and Adams remained in close communication.
"Hot Shot," 9.
for Gould, Adams Diary, Dec. 23, 1888, Adams Papers, r. 3.
for strength, Adams to M. Hughitt, April 29, 1889, UP, PO, OC, vol. 47, ser. 2, r. 42.
Hadley to Adams, UP, SG2, ser. 1, box 62, f. 4.