Sources: Uk
- Samuel L. Clemens To Charles W. and Katherine M. Dilke and Kate Field, 23 June–18 July 1872 · London, England · UCCL03718 Uk
- SLC to Chatto & Windus, 7 October 1881 · Hartford, Conn · UCCL02046 Uk
- SLC to Andrew Chatto, 1 September 1883 · Elmira, N.Y · UCCL02829 Uk
- SLC to Andrew Chatto, 17 September 1888 · Elmira, N.Y · UCCL03766 Uk
- SLC to Chatto & Windus, 27 January 1892 · Berlin, Germany · UCCL04268 Uk
- SLC to Chatto & Windus, 19 September 1899 · Sanna, Sweden · UCCL12596 Uk
- SLC to William Archer, 8 August 1900 · London, England · UCCL05848 Uk
- SLC to Charles L. Atchison, 25 September 1900 · London, England · UCCL05868 Uk
- SLC to Walpurga Ehrengarde Helena von Hohenthal Paget, December 1903 · Florence, Italy · UCCL12587 Uk
- SLC to Walpurga Ehrengarde Helena von Hohenthal Paget, December 1903 · Florence, Italy · UCCL12586 Uk
- SLC to William Archer, 22 June 1904 · Florence, Italy · UCCL06878 Uk
- SLC to Walpurga Ehrengarde Helena von Hohenthal Paget, 28 July 1904 · Lee, Mass · UCCL12588 Uk
- SLC to George Bernard Shaw, 22 December 1908 · Redding, Conn · UCCL12579 Uk
- SLC to George Bernard Shaw, 7–13 October 1909 · Redding, Conn · UCCL12580 Uk
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