Addressees: Clemens, Olivia Susan (Susy)
- Samuel L. Clemens to Olivia Susan (Susy) Clemens, 9 May 1872 · Cleveland, Ohio · UCCL00746
- Samuel L. Clemens to Olivia Susan (Susy) Clemens, 25 December 1875 · Hartford, Conn · UCCL01290
- OLC to Susy (Olivia Susan) Clemens, 19 March 1877 · Hartford, Conn · UCCL12642
- Samuel L. Clemens to Olivia Susan (Susy) Clemens, 16 July 1877 · New York, N.Y · UCCL01451
- Samuel L. Clemens to Olivia Susan (Susy) Clemens, 19 July 1877 · New York, N.Y · UCCL01455
- SLC to Susy (Olivia Susan) Clemens, 25 December 1881 · Hartford, Conn · UCCL10644
- OLC to Susy (Olivia Susan) Clemens, 25 December 1881 · Hartford, Conn · UCCL12634
- SLC to Susy (Olivia Susan) Clemens, 25 May 1882 · Hartford, Conn · UCCL09121
- SLC to Susy (Olivia Susan) Clemens, 23 November 1884 · New York, N.Y · UCCL03035
- SLC to Susy (Olivia Susan) Clemens, 5 December 1884 · Utica, N.Y · UCCL03046
- SLC to Susy (Olivia Susan) Clemens, 14 December 1884 · Grand Rapids, Mich · UCCL03059
- SLC to Susy (Olivia Susan) Clemens, 16 January 1885 · Chicago, Ill · UCCL03095
- SLC to Susy (Olivia Susan) Clemens, 23 January 1885 · St. Paul, Minn · UCCL03132
- SLC to Susy (Olivia Susan) Clemens, 3 February 1885 · Chicago, Ill · UCCL03151
- SLC to Susy (Olivia Susan) Clemens, 8 February 1885 · Indianapolis, Ind · UCCL03159
- SLC to Susy (Olivia Susan) Clemens, 15 February 1885 · Toronto, Canada · UCCL03168
- OLC to Susy (Olivia Susan) Clemens, 25 December 1885 · Hartford, Conn · UCCL12643
- SLC to Susy (Olivia Susan) Clemens, 25 December 1886 · Hartford, Conn · UCCL12635
- SLC to Susy (Olivia Susan) Clemens, 16 July 1889 · Hartford, Conn · UCCL03912
- SLC to Susy (Olivia Susan) Clemens and Clara L. Clemens, 28 June 1891 · Aix-les-Bains, France · UCCL04216
- SLC to Susy (Olivia Susan) Clemens and Clara L. Clemens, 29 June 1891 · Aix-les-Bains, France · UCCL04217
- SLC, OLC to Susy (Olivia Susan) Clemens, 22 March 1892 · Menton, France · UCCL04276
- SLC to Susy (Olivia Susan) Clemens, 24 March 1893 · SS Kaiser Wilhelm · UCCL11449
- SLC to Susy (Olivia Susan) Clemens, 7 May 1893 · Elmira, N.Y · UCCL04397
- SLC to Susy (Olivia Susan) Clemens, 6 November 1893 · New York, N.Y · UCCL04490
- SLC to Susy (Olivia Susan) Clemens, 27 December 1893 · New York, N.Y · UCCL04540
- SLC to Susy (Olivia Susan) Clemens, 8 August 1894 · New York, N.Y · UCCL04776
- OLC to Susy (Olivia Susan) Clemens, 30–31 August 1895 · SS Warrimoo · UCCL04957
- OLC to Susy (Olivia Susan) Clemens, 20 October 1895 · Ballarat, Australia · UCCL04968
- OLC to Susy (Olivia Susan) Clemens, 2 December 1895 · Palmerston North, New Zealand · UCCL04979
- OLC to Susy Clemens, 26-29 January 1896, Bombay, India · UCCL13700
- SLC to Olivia Susan (Susy) Clemens, 7 February 1896 · Calcutta, India · UCCL05018
- SLC to Susy Clemens, unknown · UCCL13676
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