Sources: CPac2
- SLC to Mary Mason Fairbanks, 20 December 1881 · Hartford, Conn · UCCL11210 CPac2
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 2 July 1883 · Elmira, N.Y · UCCL02300 MB, CPac2
- SLC to James H. Scott, 10 April 1898 · Vienna, Austria · UCCL11977 CPac2
- SLC to J. Freeman Lincoln, January 1908 · New York, N.Y · UCCL12098 CPac2
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