Smithsonian Institution Libraries. Manuscripts of the Dibner collection, 966
Collected by Bern Dibner for his Burndy Library in Norwalk, Connecticut, founded in 1941. Donated to the Smithsonian Libraries in 1974 by Dibner DSI
Summary:
Eight A.L.S. to various correspondents including De Morgan, Sieveking, and Hooker and 2 L.S. (1860 June 5 and 1901 Nov. 14) written when Spencer was ill