A. A. den Otter, The Philosophy of Railways: The Transcontinental Railway Idea in British North America (Toronto: Univ. of Toronto Press, 1997), 158.
John Harnsberger, Jay Cooke and Minnesota: The Formative Years of the Northern Pacific Railroad, 1868-1873 (New York: Arno Press, 1981), 200-201.
Cooke to Gen. George Sargent, Feb. 20, 1870, Northern Pacific, Letters no. 1 (LB), Jan. 19, 1870 - Sept. 27, 1871, Private Letters, Jay Cooke, pp. 88-89, Cooke Papers.
Larson, Cooke, 337-38.
den Otter, Philosophy of Railways, 168-69.
Harnsberger, Jay Cooke and Minnesota, 202-5
Larson, Cooke, 338.
den Otter, Philosophy of Railways, 161-62, 170.