CPH to A. N. Towne, Feb. 12, 1880, CPH Papers, ser. 2, r. 12.
C. F. Crocker to CPH, July 14, 1890 CPH Papers, ser. 1, r. 48.
CPH to Mills, March 8, 1892 CPH Papers, vol. 226, ser. 2, r. 33.
CPH to Gates, Oct. 25, 1892, CPH Papers, ser. 1, r. 51, unsigned to Wm. Dick, June 11, 1893, CPH Papers, ser. 1, r. 52.
C. F. Crocker to CPH, June 9, July 29, 1890 CPH Papers, ser. 1, r. 48.
C. F. Crocker to CPH, March 16, 1887 CPH Papers, ser. 1, r. 45.