Sources: IaCr2
- SLC to Frederick J. Hall, 1 October 1885 · Hartford, Conn · UCCL03272 IaCr2
- SLC to Sarah O. Jewett, 14 March 1887 · Hartford, Conn · UCCL03540 IaCr2
- SLC to Henry H. Rogers, 23 July 1897 · Weggis, Switzerland · UCCL05268 IaCr2
- SLC to Beatrice M. Benjamin, 27 October 1909 · Redding, Conn · UCCL08477 IaCr2
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