C. F. Crocker to CPH, March 16, 1887 CPH Papers, ser. 1, r. 45.
W. G. Curtis to CPH, Sept. 6, 1895, HEH Collection.
CPH to J. Kruttschnitt, Aug. 31, 1897, HEH Collection.
E. L. Corthell to CPH, Feb. 217, 1893.
Simon Stevens to Ignacio Mariscal, April 7, 1893, The Two Republics, Aug. 5, 1893, enclosure with Corthell to CPH, Aug. 16, 1893. CPH Papers, ser. 1, r. 51; E. L. Corthell to CPH, Jan. 27, 1894, CPH Papers, r. 52.
Samuel Killibrew to CPH, June 8, 1894, CPH Papers, ser. 1, r. 53.