Addressees: Robinson, Henry C
- Samuel L. Clemens to Joseph H. Sprague and Others, 21 February 1875 · Hartford, Conn · UCCL01196
- SLC to Henry C. Robinson, 11 July 1883 · Elmira, N.Y · UCCL11235 CLjC
- SLC to Henry C. Robinson, 15 September–16 September 1884 · Elmira, N.Y · UCCL11234 CU-MARK, Axelrod
- SLC to Henry C. Robinson, 13 May 1885 · Hartford, Conn · UCCL12379 NPV
- SLC to Henry C. Robinson, 28 March 1892 · Rome, Italy · UCCL04280 CU-MARK
- SLC to Henry C. Robinson, 29 March 1892 · Rome, Italy · UCCL02381 CU-MARK
- SLC to Henry C. Robinson, 1 April 1892 · Rome, Italy · UCCL04281 CU-MARK
- SLC to Henry C. Robinson, 5 April 1892 · Rome, Italy · UCCL04282 CU-MARK
- SLC to Henry C. Robinson, 18 April 1892 · Rome, Italy · UCCL04283 CU-MARK
- SLC to Henry C. Robinson, 13 November 1892 · Florence, Italy · UCCL11049 CtY
- SLC to Henry C. Robinson, 20 July 1893 · Krankenheil, Germany · UCCL11050 CtY
- SLC to Henry C. Robinson, 20 April 1894 · New York, N.Y · UCCL04722 CtH2
- SLC to Henry C. Robinson, 23 July 1894 · New York, N.Y · UCCL11051 CtY
- SLC to Henry C. Robinson, 29 November 1894 · Paris, France · UCCL11053 CtY
- SLC to Henry C. Robinson, 24 December 1895 · SS Oceana · UCCL11219 AuSN-M
- SLC to Henry C. Robinson, 4 July 1896 · Cape Town, Cape Colony · UCCL11052 CtY
- SLC to Henry C. Robinson, 28 September 1896 · London, England · UCCL05120 CtY-BR
- SLC to Henry C. Robinson, 8 November 1896 · London, England · UCCL11054 CtY-BR
- SLC, OLC to Henry C. Robinson, 13 January 1898 · Vienna, Austria · UCCL11123 CtY-BR
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