Sources: PU
- SLC to James R. Osgood, 31 October 1881 · Hartford, Conn · UCCL02078
- SLC to Edward Everett Hale, 1 November 1899 · London, England · UCCL05698
- SLC to Edward Everett Hale, 28 March 1905 · New York, N.Y · UCCL07023
- SLC per Isabel V. Lyon to Edward Everett Hale, 10 April 1906 · New York, N.Y · UCCL07418
1