CPH to A. Hutchison, Feb. 3, 1887, CPH to A. Towne, Feb. 17, 1887, CPH Papers, ser. 2, r. 27.
Arthur T. Hadley, "The Workings of the Interstate Commerce Law," Quarterly Journal of Economics 2 (Jan. 1888): 162, 170-72.
Hornaday, Extermination of the American Bison, 440-41, 513-21.
Adams sent Hadley a copy of the speech.
Adams to Hadley, Dec. 26, 1888, UP, PO, OC, vol. 45, ser. 2, r. 41.
Hadley and Adams were conferring during 1888.
Hadley to Adams, March 11, 1888, UP, SG2, ser. 1, box 62, f. 4.
Hadley, "Interstate Commerce Law," 176, 184-87.