C. E. Bretherton to CPH, March 14, 1894 CPH Papers, ser. 1, r. 52.
C. E. Bretherton to CPH, April. 18, 1894 CPH Papers, ser. 1, r. 53.
C. E. Bretherton to CPH, May 13, 1894.
I. E. Requa to CPH, May 24, 1894 CPH Papers, ser. 1, r. 53.
C. E. Bretherton to I. E. Requa, May 16, 1894 CPH Papers, ser. 1, r. 53.
C.E. Bretherton to I.E. Requa, May 16, 1894CPH Papers, ser. 1, r. 53.
CPH to Gates, May 8, 1890CPH Papers, ser. 1, r. 48.
C. E. Bretherton to CPH, May 18, 1894 CPH Papers, ser. 1, r. 53.