Addressees: Spofford, Ainsworth R
- Samuel L. Clemens to Ainsworth R. Spofford, 10? October 1870 · Buffalo, N.Y · UCCL00507
- Samuel L. Clemens and Charles Dudley Warner to Ainsworth R. Spofford, 21 April 1873 · Hartford, Conn · UCCL00904
- Samuel L. Clemens to Ainsworth R. Spofford, 19 March 1874 · Hartford, Conn · UCCL01065
- Samuel L. Clemens to Ainsworth R. Spofford, 7 May 1874 · Elmira, N.Y · UCCL01084
- Samuel L. Clemens to Ainsworth R. Spofford, 21 May 1874 · Elmira, N.Y · UCCL01092
- Samuel L. Clemens to Ainsworth R. Spofford, 16 February 1875 · Hartford, Conn · UCCL01194
- Samuel L. Clemens to Ainsworth R. Spofford, 23 October 1876 · Hartford, Conn · UCCL02467
- Samuel L. Clemens to Ainsworth R. Spofford, 18 July 1877 · Hartford, Conn · UCCL12308
- Samuel L. Clemens to Ainsworth R. Spofford, 26 September 1879 · Elmira, N.Y · UCCL01693
- Samuel L. Clemens to Ainsworth R. Spofford, 11 March 1880 · Hartford, Conn · UCCL01770
- Samuel L. Clemens to Ainsworth R. Spofford, 3 June 1882 · Hartford, Conn · UCCL13099
- SLC to Ainsworth R. Spofford, 28 February 1884 · Hartford, Conn · UCCL02924
- SLC to Ainsworth R. Spofford, 11 August 1896 · London, England · UCCL08841
- SLC to Ainsworth R. Spofford, 30 January 1897 · London, England · UCCL05502
- SLC to Ainsworth R. Spofford, 19 May–12 July 1897 · London, England · UCCL05218
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