Sources: TxHuT
- Samuel L. Clemens to J. Murray Moore, per Charles Warren Stoddard, 9 January 1874 · Liverpool, England · UCCL01036
- SLC to Sol Smith Russell, 15 March 1878 · Hartford, Conn · UCCL13771
- Samuel L. Clemens to U. D., 5 November 1879 · Hartford, Conn · UCCL01706
- SLC to Charles Casey, 2 March 1885 · Hartford, Conn · UCCL08833
- SLC to Clover Club, 16 November 1886 · Hartford, Conn · UCCL03481
- SLC to the Clover Club, 10 April 1889 · Hartford, Conn · UCCL13777
- SLC to J. Y. W. MacAlister, 30 March 1897 · London, England · UCCL13770
- SLC to Unidentified, 5 July 1897 · London, England · UCCL05250
- SLC to Francis H. Skrine, 24 May 1899 · Vienna, Austria · UCCL05595
- SLC to Elizabeth N. Fairchild, 7 June 1899 · Broadstairs, England · UCCL14003
- SLC to J. Y. W. MacAlister, 21 March 1900, London, England · UCCL14004
- SLC to Louise Brownell Saunders, 3 March 1901 · New York, N.Y · UCCL13773
- SLC per IVL to Elizabeth Fairchild, 14 November 1902 · Riverdale, N.Y · UCCL13778
- SLC to George Daulton, 21 July 1903 · Elmira, N.Y · UCCL06706
- SLC to George W. Perrigo, \"18 April n.y. · Hartford, Conn · UCCL13776
- SLC to Elizabeth Marbury, 8 April 1901 · New York, N.Y · UCCL13774
- SLC to A. M. Edwards, 13 December 1880 · Hartford, Conn · UCCL13775
- SLC per IVL to Edmund C. Stedman, 27 March 1903 [postmarked] · Riverdale, N.Y · UCCL13772
1