CPH to HEH, June 13, 1893, HEH Collection.
CPH to Speyer & Co., June 20, 1893 (seven separate letters), HEH Collection.
FH. Hant? To CPH, April 4, 1894, CPH Papers, ser. 1, r. 53, also CPH to Speyer & Co., June 20, 1893, HEH Collection.
Speyer & Co. (Wm Bonn) to CPH, Jan. 26, 1894, CPH Papers, ser. 1, r. 52.
Charles Tweed to CPH, April 2, 1894, HEH Collection.
Charles Tweed to CPH, April 2, 1894, HEH Collection.