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