Sources: Ct
- Samuel L. Clemens to Colt’s Patent Fire Arms Manufacturing Company, 12 July 1872 · New Saybrook, Conn · UCCL00768 Ct
- Samuel L. Clemens to William B. Franklin, 12 May 1877 · Hartford, Conn · UCCL10581 Ct
- Samuel L. Clemens to the Editor of the Hartford Courant, 22 November 1879 · Hartford, Conn · UCCL01725 Ct
- SLC to John C. Kinney, 15 December 1885 · Hartford, Conn · UCCL03333 Ct
- SLC to Sara T. Kinney, 13 February 1886 · Hartford, Conn · UCCL10551 Ct
- William D. Howells to SLC, 27 April 1889 · New York, N.Y. · UCLC44512 Ct
- SLC to John C. Kinney, 28 September 1889 · Hartford, Conn · UCCL03943 Ct
- SLC to John C. Kinney, 15 May n.y. · Unknown place · UCCL10550 Ct
- George Washington Cable to SLC, Unknown date, Unknown place · UCLC42205 Ct
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