Sources: NjP2
- Samuel L. Clemens to Thomas Nast, 17 December 1872 · Hartford, Conn · UCCL00846
- Samuel L. Clemens to James Hammond Trumbull, 15 February 1873 · Hartford, Conn · UCCL00873
- Samuel L. Clemens to Tom Hood and George Routledge and Sons, 10 March 1873 · Hartford, Conn · UCCL00886
- Samuel L. Clemens to Mary Mason Fairbanks, 6 July 1873 · London, England · UCCL00947
- Samuel L. Clemens to Charles Dudley Warner, 10? July 1873 · London, England · UCCL00951
- Samuel L. Clemens to Elisha Bliss, Jr., 2 August 1873 · Edinburgh, Scotland · UCCL05816
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