Sources: DNA
- Samuel L. Clemens to Mortimer D. Leggett with an affidavit by John Hooker, 6 October 1871 · Hartford, Conn · UCCL00656
- Samuel L. Clemens to Rutherford B. Hayes, 20 September 1877 · Hartford, Conn · UCCL01483
- Samuel L. Clemens to John Sherman, 20 September 1877 · Hartford, Conn · UCCL01484
- Samuel L. Clemens to John Sherman, 22 September 1877 · Hartford, Conn · UCCL01487
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