W. H. Mills to CPH, Dec. 22, 1893, CPH Papers, ser. 1, r. 52.
Ernst von Hesse-Wartegg, "Across Nebraska by Train in 1877: The Travels of Ernst von Hesse-Wartegg," trans. and ed. by Frederic Trautmann, Nebraska History 65 (Fall 1984): 411-15.
Hesse-Wartegg, "Across Nebraska by Train," 412-14.
See Sidney Dillon, "The West and the Railroads," North American Review 152 (April 1891): 443-51.
