Sources: NcD
- SLC, OLC to Thomas and Elizabeth Wardle, 7 January 1902 · Riverdale, N.Y · UCCL06225
- SLC to Thomas Wardle, 2 November 1902 · Riverdale, N.Y · UCCL06481
- SLC per Isabel V. Lyon to David A. Munro, 19 January 1903 · Riverdale, N.Y · UCCL06568
- SLC to Unidentified, November 1907 · New York, N.Y · UCCL12689
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