Sources: UPB
- SLC to John Brown, Jr., 29 October 1882 · Hartford, Conn · UCCL08906
- SLC to John Brown, Jr., 16 December 1882 · Hartford, Conn · UCCL08905
- SLC to Robert McClure, 26 February 1892 · Berlin, Germany · UCCL10864
- Isabel V. Lyon for SLC to George L. Beam, 18 December 1907 · New York, N.Y · UCCL10867
- SLC to Julian Alden Weir, 6 October 1909 · Redding, Conn · UCCL13508
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