Sources: NcWsW
- Christian Bernhard Tauchnitz to SLC, 28 December 1878 · Leipzig, Germany · UCLC32706 NcWsW
- SLC to Miss Milly, 12 September 1883 · Elmira, N.Y · UCCL09328 NcWsW
- SLC, OLC to Hattie J. Gerhardt, 30 May 1885 · Hartford, Conn · UCCL03232 NcWsW
- SLC to Miss Sanborn, Unknown date, New York, N.Y · UCCL09001 NcWsW
- SLC to Unidentified, 12 February 1893 · Florence, Italy · UCCL04338 NcWsW
- SLC to Frank Willard, 18 June 1901 · New York, N.Y · UCCL09502 NcWsW
- SLC to ? Fischer, 17 December 1901 · Riverdale, N.Y · UCCL10793 NcWsW
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