Addressees: Clemens, William M
- Samuel L. Clemens to William M. Clemens, 18 November 1879 · Hartford, Conn.Hartford, Conn.Hartford, Conn · UCCL01719
- SLC to William M. Clemens, 16 January 1881 · Hartford, Conn · UCCL01893
- SLC to William M. Clemens, January 1882 · Hartford, Conn · UCCL02139
- SLC to William M. Clemens, February 1883 · Hartford, Conn · UCCL11815
- SLC to William M. Clemens, 1 January 1900 · London, England · UCCL12034
- SLC to William M. Clemens, 12 February 1900 · London, England · UCCL11970
- SLC to William M. Clemens, 6 June 1900 · London, England · UCCL08202
- OLC to William M. Clemens, 16 February 1902 · Riverdale, N.Y · UCCL07095
- Isabel V. Lyon for SLC to Will M. Clemens, 31 March 1903 · Riverdale, New York · UCCL13052
- OLC to William M. Clemens, Unknown date, Riverdale, N.Y · UCCL09060
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