Speyer & Co. to CPH, Aug. 23, 1893, CPH Papers, ser. 1, r. 52.
Speyer & Co. to CPH, Dec. 6, 1893, CPH Papers, ser. 1, r. 52.
C. F. Crocker to CPH, Oct. 23, 1893 CPH Papers, ser. 1, r. 52.
C. F. Crocker to CPH, Nov. 6, 1893 CPH Papers, ser. 1, r. 52.
Speyer & Co. (Wm Bonn) to CPH, Jan. 26, 1894, CPH Papers, ser. 1, r. 52.
Charles Tweed to CPH, April 2, 1894, HEH Collection.