Sources: DSI-AAA
- SLC to F. Hopkinson Smith, 6 April 1883 · Hartford, Conn · UCCL13572 DSI-AAA
- SLC to Unidentified, 4 March 1887 · Hartford, Conn · UCCL03535 DSI-AAA
- SLC to Elizabeth M.(Lily) Millet, 1 February 1894 · New York, N.Y · UCCL11500 DSI-AAA
- SLC to Abbott H. Thayer, 27 June 1901 · Saranac Lake, N.Y · UCCL13137 DSI-AAA
- SLC to Abbott H. Thayer, 23 February 1905 · New York, N.Y · UCCL13138 DSI-AAA
- SLC to George de Forest Brush, 22 May 1908 · New York, N.Y · UCCL11340 DSI-AAA, CU-MARK
- SLC to Abbott H. Thayer, 16 September 1909 · Redding, Conn · UCCL13136 DSI-AAA
1