Towne to CPH, Dec. 5 1871, CPH Papers, ser. 1, r. 4.
Maury Klein, Union Pacific (Garden City, N.Y.: Doubleday, 1987), 200-201.
Towne to CPH, Dec. 16, 1871, CPH Papers, ser. 1, r. 4.
Towne to CPH, Dec. 19, 1871, CPH Papers, ser. 1, r. 4.
Cummins to CPH, Dec. 21, 1871, Towne to CPH, Dec. 23, 24, 27, 1872, CPH Papers, ser. 1, r. 4.
Klein, Union Pacific, 318, 397-99.