C. F. Crocker to CPH, June 9, 18, July 3, July 12, July 14, 1890 CPH Papers, ser. 1, r. 48.

C. F. Crocker to CPH, Nov. 9, 1891 CPH Papers, r. 50.

CPH to W. H. Mills, July 6, 1892 CPH Papers, vol. 228, ser. 2, r. 33.

CPH to Gates, May 10, 1890, telegram CPH Papers, ser. 1, r. 48.