Sources: Me4
- SLC to Orion Clemens, 7 May 1863 · San Francisco, Calif · UCCL12990
- SLC to Arthur Jenkins, 1 February 1887 · Hartford, Conn · UCCL12976
- SLC to Percy Spalding, 8 July 1897 · London, England · UCCL12988
- SLC to Judson Smith, 12 February 1901 · New York, N.Y · UCCL12983
- SLC to Albert Bigelow Paine, 16 November 1901 · Riverdale, N.Y · UCCL12984
- SLC to Edward W. Ordway, 4 January 1903 · Riverdale, N.Y · UCCL12871
- SLC per Isabel V. Lyon to Albert Bigelow Paine, 19 August 1904 · Lee, Mass · UCCL12989
- SLC to Louise Paine, 4 November 1908 · Redding, Conn · UCCL08151
- Isabel V. Lyon to Louise Paine, 10 February 1909 · Redding, Conn · UCCL10989
- SLC to Louise Paine, 9 October 1909 · Redding, Conn · UCCL12973
- SLC to Louise Paine, 17 December 1909 · Hamilton, Bermuda · UCCL12975
- SLC to Louise Paine, 23 February 1910 · Hamilton, Bermuda · UCCL02275
- SLC to Louise Paine, 24 February 1910 · Hamilton, Bermuda · UCCL12977
- SLC to Louise Paine, 24 March 1910 · Hamilton, Bermuda · UCCL02321
- SLC to Louise Paine, Unknown date, New York, N.Y · UCCL12992
- SLC to Albert Bigelow Paine, Unknown date, Redding, Conn · UCCL12991
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