CPH to C. F. Crocker, July 18, 1893, CPH Papers, ser. 1, r. 52.
C. F. Crocker to CPH, July 10, 1893, Speyer & Co. to CPH, July 22, 1893 CPH Papers, ser. 1, r. 52.
C. F. Crocker to CPH, Aug. 3, 1893CPH Papers, ser. 1, r. 52.
H. Spencer to CPH, Aug. 23, 1893, CPH Papers, ser. 1, r. 52.
T. H. Hubbard to CPH, March 13, 1894, CPH Papers, ser. 1, r. 52.