Sources: VtMiM
- Samuel L. Clemens to William S. Andrews, 10 September 1873 · London, England · UCCL00960
- Samuel L. Clemens to William S. Andrews, 28 March 1874 · Hartford, Conn · UCCL01070
- Samuel L. Clemens to Thomas Bailey Aldrich, 18 December 1874 · Hartford, Conn · UCCL01166
- Samuel L. Clemens to Miss Higgins, 28 January 1876 · Hartford, Conn · UCCL06254
- Samuel L. Clemens to Edwin Booth, 7 April 1877 · Hartford, Conn · UCCL01411
- Samuel L. Clemens to Thomas Bailey Aldrich, 3 June 1877 · Hartford, Conn · UCCL01437
- Samuel L. Clemens to Thomas Bailey Aldrich, 17? November 1877 · Hartford, Conn · UCCL01507
- Samuel L. Clemens to Mr. Tyler, 30 July 1878 · Baden Baden, Germany · UCCL01580
- Samuel L. Clemens to Thomas Bailey Aldrich, 15 September 1880 · Elmira, N.Y · UCCL01834
- SLC to Roswell Smith, 9 March 1885 · Hartford, Conn · UCCL03186
- SLC to Frederick J. Hall, 11 January 1889 · Hartford, Conn · UCCL03850
- SLC to James G. Bennett, 24 June 1897 · London, England · UCCL05232
- SLC to Henry Campbell-Bannerman, 6 September 1906 · Dublin, N.H · UCCL07519
- SLC to Joseph H. Twichell, 17 April 1908 · New York, N.Y · UCCL07900
- SLC to Thomas Bailey Aldrich, Unknown date · Unknown place · UCCL07546
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