J. H. Woodard to (Gates?), Feb. 14, 1891, CPH Papers, ser. 1, r. 49.
J. Stubbs to CPH, Oct. 10, 1892, CPH Papers, ser. 1, r. 51.
Mills to CPH, Feb. 4, 1893, CPH Papers, ser. 1, r. 51.
CPH to HEH, June 29, 1893, HEH to CPH, Oct. 16, 1893, HEH Collection.
William Mahl, Memoirs, Southern Pacific Co. F3-F-5, Mahl Papers.
A. C. Bassett to CPH, May 8, 1891, C. Crocker to CPH, June 30, 1891, W. H. Mills to CPH, July 10, 1891, CPH Papers, ser. 1, r. 49.
W. H. Mills to CPH, June 30, 1892, CPH Papers, ser. 1, r. 51.