"Statement of Chicago business to/from and through Denver Colonel during the year 1878," 33 1870 7.42-8.11, CB&Q.
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.
Perkins to Forbes, May 23, 1884, 33, 1880, 7.2, CB&Q.
Adams to Perkins, Dec. 30, 1885, UP, PO, OC, vol. 30, ser. 2, r. 26.
for Adams's rationales, Adams to Gould, July 3, 1886, UP, PO, OC, vol. 29, ser. 2, r. 24.
Harley, American Railroad Construction, 798-803.
Adams to G. Callaway, Sept. 12, 1884, UP, PO, OC, vol. 24, ser. 2, r. 20.
Adams to Callaway, Dec. 28, 1885, UP, PO, OC, vol. 33, ser. 2, r. 28.