Sources: MoHM
- SLC to Unidentified, 9 May 1867 · New York, N.Y · UCCL10643
- SLC to George L. Fall, 28 November 1871 · Albany, N.Y · UCCL12695
- Samuel L. Clemens to Colton Greene, 26 April 1873 · Hartford, Conn · UCCL11885
- Samuel L. Clemens to John L. RoBards, 17 April 1876 · Hartford, Conn · UCCL01324
- Samuel L. Clemens to John L. RoBards, 10 June 1876 · Hartford, Conn · UCCL01341
- Samuel L. Clemens to Olivia L. Clemens, 5 August 1878 · Allerheiligen, Germany · UCCL01583
- SLC to Karl Gerhardt, 3 March 1881 · Hartford, Conn · UCCL08590
- SLC to James R. Osgood, 27 October 1881 · Hartford, Conn · UCCL09947
- SLC to John L. Robards, 10 June 1882 · Hartford, Conn · UCCL02217
- SLC to John L. Robards, 2 August 1882 · Elmira, N.Y · UCCL02248
- SLC to Minnie T. Dawson, 13 January 1885 · Hannibal, Mo · UCCL09334
- OLC to Edward K. Root, 20 April 1885 · Hartford, Conn · UCCL12668
- SLC to J. W. Atterbury, 20 January 1886 · Hartford, Conn · UCCL03358
- SLC to OLC, 6 June 1888 · New York, N.Y · UCCL03722
- SLC to Clara L. Spaulding, 29 September 1889 · Hartford, Conn · UCCL03944
- SLC per Franklin G. Whitmore to Henry Holiday, 18 May 1890 · Hartford, Conn · UCCL13053
- SLC to Chatto & Windus, 16 October 1891 · Berlin, Germany · UCCL04244
- SLC to Chatto & Windus, 28 August 1894 · Etretat, France · UCCL04783
- SLC to Chatto & Windus, 12 September 1894 · Etretat, France · UCCL04787
- SLC to Andrew Chatto, 3 and 6 January 1895 · Paris, France · UCCL04831
- SLC to Chatto & Windus, 7 January 1895 · Paris, France · UCCL04832
- SLC to Anna Goodenough, 14 August 1896 · Guildford, England · UCCL12446
- SLC to Andrew Chatto, 4 October–18 October 1896 · London, England · UCCL08842
- SLC to Unidentified, 15 October 1896 · London, England · UCCL09408
- SLC to Chatto & Windus, 20 October 1896 · London, England · UCCL05132
- SLC to Chatto & Windus, 26 October 1896 · London, England · UCCL05135
- SLC to Chatto & Windus, 27 October 1896 · London, England · UCCL05137
- SLC to Chatto & Windus, 17 November 1896 · London, England · UCCL05143
- SLC to Chatto & Windus, 18 November 1896 · London, England · UCCL05145
- SLC to Chatto & Windus, 3 September 1897 · Weggis, Switzerland · UCCL05287
- SLC to Chatto & Windus, 6 May 1898 · Vienna, Austria · UCCL05384
- OLC to Chatto & Windus, 6 May 1898 · Vienna, Austria · UCCL05383
- SLC to Chatto & Windus, 7 May 1898 · Vienna, Austria · UCCL05385
- SLC to Chatto & Windus, 13 May 1898 · Vienna, Austria · UCCL05388
- SLC to Robert Collier, 20 June 1898 · Kaltenleutgeben, Austria · UCCL11675
- SLC to Chatto & Windus, 6 July 1898 · Kaltenleutgeben, Austria · UCCL05408
- SLC to Charles Frederic Moberly Bell, 6 April 1900 · London, England · UCCL05787
- SLC to Lyman J. Gage, 27 September 1900 · London, England · UCCL05860
- OLC to Mrs. Fuller, 8 January 1901 · New York, N.Y · UCCL12669
- SLC to Mary N. Hubbard, 13 January 1901 · New York, N.Y · UCCL05964
- SLC to Barbara Mullen, 20 May 1901 · New York, N.Y · UCCL06058
- SLC to Barbara Mullen, 30 May 1901 · New York, N.Y · UCCL06065
- SLC to Chatto & Windus, 24 November 1901 · Riverdale, N.Y · UCCL06178
- OLC to Virginia Boyle, 24 April 1902 · Riverdale, N.Y · UCCL12670
- OLC to Virginia Boyle, 26 May 1902 · Riverdale, N.Y · UCCL12671
- SLC to Minnie T. Dawson, 30 May 1902 · Hannibal, Mo · UCCL08880
- SLC to Anna M. Schnizlein, 2 June 1902 · Hannibal, Mo · UCCL11663
- SLC to John L. Robards, 3 June 1902 · Hannibal, Mo · UCCL06354
- SLC to Minnie T. Dawson, 12 June 1902 · Riverdale, N.Y · UCCL06360
- SLC to W. H. Dulany, 17 June 1902 · Riverdale, N.Y · UCCL08881
- SLC to ? Miller, 17 June 1902 · Riverdale, N.Y · UCCL06367
- SLC to O. B. Sears, 16 July 1902 · York Harbor, Me · UCCL06388
- SLC to Minnie T. Dawson, 6 December 1902 · Riverdale, N.Y · UCCL06501
- SLC to Clara L. Clemens, 20 May 1905 · Dublin, N.H · UCCL07046
- SLC to Clara L. Clemens, 17 July 1905 · Dublin, N.H · UCCL07084
- SLC to Clara L. Clemens, 28 August 1905 · Boston, Mass · UCCL07119
- SLC to Barbara Mullen, 17 November 1905 · New York, N.Y · UCCL07211
- SLC, Isabel V. Lyon to Barbara Mullen, 14 June 1906 · Dublin, N.H · UCCL07458
- SLC to Phillips, McClure & Co., 20 November 1906 · New York, N.Y · UCCL07292
- SLC to Jean Clemens, 30 June 1907 · London, England · UCCL07771
- SLC to W. H. Powell, 3 December 1907 · New York, N.Y · UCCL07881
- SLC to John L. Robards, 7 June 1908 · New York, N.Y · UCCL08025
- SLC to Champ Clark, 15 November 1908 · Redding, Conn · UCCL11687
- SLC to Clara L. Clemens, 11 December 1908 · Redding, Conn · UCCL08179
- SLC to Champ Clark, 11 December 1908 · Redding, Conn · UCCL11688
- SLC to Champ Clark, 5 June 1909 · Redding, Conn · UCCL08415
- SLC per Albert Bigelow Paine to John L. RoBards, 10 or 11 January 1910 · Redding, Conn · UCCL11965
- SLC to William L. Phelps, 12 March 1910 · Hamilton, Bermuda · UCCL08571
- SLC to Clara L. Clemens, 12 March 1910 · Hamilton, Bermuda · UCCL08569
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