"Powderly at Denver," 138; "News," Union Pacific Employes' Magazine, June 1887, p. 145.
Union Pacific Employes' Magazine, July 1887, p. 154; Union Pacific Employes' Magazine, Sept. 1887, p. 251.
"Killed by a Bomb," New York Times, July 6, 1897, p. 1.
Elizabeth Sanders, Roots of Reform: Farmers, Workers, and the American State (Chicago: Univ. of Chicago Press, 1999), 189.
Hornaday, Extermination of the American Bison, 440-41, 513-21.
The basic details come from W. E. Costello to C. G. Wheeler, June 1, 1890, Aug. 1, 1890, CPH Papers, ser. 1, r. 48. See also C. L. Cline to A. Manvel, Aug. 4, 1890, illegible, Law Department of AT&SF to J. D. Springer, Aug. 28, 1890, and CPH to Manvel, Sept. 19, 1890, CPH Papers, ser. 1, r. 48.
also Michael Grogan to CPH, June 7, 1891, CPH Papers, ser. 1, r. 49.