CPH to Hopkins, Sept. 5, 1873, LB, 5:19, box 22, Hopkins Collection.
Cooke to Moorhead, July 1, 1871, Northern Pacific, Letters no. 1 (LB), Jan. 19, 1870 - Sept. 27, 1871, Private Letters, Jay Cooke, p. 236, Cooke Papers.
Robin Winks, Frederick Billings: A Life (Berkeley: Univ. of California Press, 1991), 88-89, 193, 195.
Harnsberger, Jay Cooke and Minnesota, 80-81.
Jay Cooke Jr. to Jay Cooke, Aug. 20, 1872, LBs, Cooke Papers.
"Red River," Cooke to McCulloch, Sept. 4, 1871, Northern Pacific, Letters no. 1 (LB), Jan. 19, 1870 - Sept. 27, 1871, Private Letters, pp. 679-80.
Cooke to Lorin, Jan. 7, 1873, Cooke to Cass, Oct. 25, 1872, Cooke Papers; Larson, Cooke, 376-77, 392-93, 401, 405.
Missouri, Cooke to O. W. Mead, April 1, 1873, LBs, Cooke Papers.
Poor, Manual, 1873-84, 393.