Sources: CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 17 September 1864 · San Francisco, Calif · UCCL00086
- Samuel L. Clemens to William Wright (Dan De Quille), 14 July 1865 · San Francisco, Calif · UCCL11610
- Samuel L. Clemens to W. C. Kimball and W. W. Kimball, 26 April 1866 · Island of Maui, Sandwich Islands · UCCL00098
- Samuel L. Clemens to Emeline B. Beach, 31 January 1868 · Washington, D.C · UCCL00187
- Samuel L. Clemens to Emeline B. Beach, 10 February 1868 · Washington, D.C · UCCL00192
- Samuel L. Clemens to Frank Fuller, 15 August 1868 · Hartford, Conn · UCCL02744
- Samuel L. Clemens to Frank Fuller, 24 September 1868 · St. Louis, Mo · UCCL02753
- Samuel L. Clemens to Frank Fuller, 5–30 October 1868 · Hartford, Conn · UCCL09079
- Samuel L. Clemens to Edward L. Burlingame, 7 October 1868 · Hartford, Conn · UCCL02757
- Samuel L. Clemens to Pamela A. Moffett, 29? November 1868 · New York, N.Y · UCCL02771
- Samuel L. Clemens to Jervis Langdon, 29 December 1868 · Cleveland, Ohio · UCCL00212
- Samuel L. Clemens to Jane Lampton Clemens and Family, 26? March 1869 · Elmira, N.Y · UCCL00285
- Samuel L. Clemens to A. Miner Griswold (Fat Contributor), 1 September 1869 · Buffalo, N.Y · UCCL11538
- Samuel L. Clemens to Frank Fuller, 21 May 1870 · Buffalo, N.Y · UCCL00466
- Samuel L. Clemens to Elisha Bliss, Jr., 5 August 1870 · Elmira, N.Y · UCCL10994
- Samuel L. Clemens to Iretus G. Cardner, 26 October 1870 · Buffalo, N.Y · UCCL00515
- Samuel L. Clemens to Francis P. Church, 23 December 1870 · Buffalo, N.Y · UCCL02786
- Samuel L. Clemens to Alfred B. Crandell and Other Members of the Farmers’ Club, 26 December 1870 · Buffalo, N.Y · UCCL02788
- Samuel L. Clemens to James N. Gillis, 2 July 1871 · Elmira, N.Y · UCCL00631
- Samuel L. Clemens to James Redpath and George L. Fall, 13 January 1872 (1st of 2) · Pittsburgh, Pa · UCCL00717
- Samuel L. Clemens to Olivia L. Clemens, 12 October 1872 · London, England · UCCL00822
- Samuel L. Clemens to Mary Hunter Smith, 10 December 1872 · Hartford, Conn · UCCL11669
- Samuel L. Clemens to Olivia Lewis Langdon, 20 July 1873 · York, England · UCCL00955
- Samuel L. Clemens to Henry Lee, 25 or 26 September 1873 · London, England · UCCL00965
- Samuel L. Clemens to John Brown, 30 October 1873 · SS Batavia en route from Liverpool, England, to New York, N.Y · UCCL00978
- Samuel L. Clemens to Elisha Bliss, Jr., 19 February 1874 · Hartford, Conn · UCCL01052
- Samuel L. Clemens to Mr. McElroy, 10 March 1874 · Hartford, Conn · UCCL11635
- Samuel L. Clemens to Editor of the New York Evening Post, 25 June 1874 · Elmira, N.Y · UCCL00934
- Samuel L. Clemens to Frank Fuller, 6 September 1874 · Elmira, N.Y · UCCL01124
- Samuel L. Clemens to James R. Osgood, 20 February 1875 · Hartford, Conn · UCCL11540
- Samuel L. Clemens to William Wright (Dan De Quille), 1 May 1875 · Hartford, Conn · UCCL01273
- Samuel L. Clemens to William Wright (Dan De Quille), 17 September 1875 · Hartford, Conn · UCCL11612
- Samuel L. Clemens to To William Wright (Dan De Quille) per Unidentified Stenographer, 5 January 1876 · Hartford, Conn · UCCL01296
- Samuel L. Clemens to William Wright (Dan De Quille), 28 January 1876 · Hartford, Conn · UCCL01304
- Samuel L. Clemens to William Wright (Dan De Quille), 8 February 1876 · Hartford, Conn · UCCL01305
- Samuel L. Clemens to William Wright (Dan De Quille), 29 November 1876 · Hartford, Conn · UCCL02466
- Samuel L. Clemens to Miss Holmes, 13 April 1877 · Hartford, Conn · UCCL11456
- Samuel L. Clemens to Richard Edwards, per Olivia L. Clemens, 16 July 1877 · Elmira, N.Y · UCCL11826
- Samuel L. Clemens to Margaret C. Avery, November 1877 · Hartford, Conn · UCCL12465
- Samuel L. Clemens to Andrew Chatto, 3 June 1878 · Heidelberg, Germany · UCCL01567
- Samuel L. Clemens to William A. Seaver, 28 June 1878 · Heidelberg, Germany · UCCL01574
- Samuel L. Clemens to Francis E. Bliss, 13 July 1878 · Heidelberg, Germany · UCCL01576
- Samuel L. Clemens to Olivia L. Clemens, 26 August 1878 · St. Niklaus, Switzerland · UCCL01590
- Samuel L. Clemens to Daniel Slote, 4 September 1879 · Elmira, N.Y · UCCL10434
- Samuel L. Clemens to Francis E. Bliss, 8 September 1879 · Elmira, N.Y · UCCL01684
- Samuel L. Clemens to Frank Fuller, 22 November 1879 · Hartford, Conn · UCCL01723
- Samuel L. Clemens to Frank Fuller, 5 December 1879 · Hartford, Conn · UCCL01733
- Samuel L. Clemens to Frank Fuller, 19 December 1879 · Hartford, Conn · UCCL01742
- Samuel L. Clemens to Frank Fuller per Telegraph Operator, 30 October 1880 · Hartford, Conn · UCCL01849
- SLC to OLC, 7 June 1881 · Hartford, Conn · UCCL01839
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 31 August 1881 · Elmira, N.Y · UCCL02019
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 24 February 1882 · Hartford, Conn · UCCL02165
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 21 March 1882 · Hartford, Conn · UCCL02177
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 23 March 1882 · Hartford, Conn · UCCL02179
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 25 January–6 February 1883 · Hartford, Conn · UCCL10134
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 26 March 1883 · Hartford, Conn · UCCL02364
- SLC to James R. Osgood, 6 April 1883 · Hartford, Conn · UCCL02803
- SLC to Henry C. Robinson, 11 July 1883 · Elmira, N.Y · UCCL11235
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 20 July 1883 · Elmira, N.Y · UCCL11182
- SLC to Charles L. Webster, 30 October 1883 · Hartford, Conn · UCCL11181
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 5 March 1884 · Hartford, Conn · UCCL02926
- SLC to Andrew Chatto, 1 April 1884 · Hartford, Conn · UCCL11941
- SLC to Unidentified, 5 August 1884 · Elmira, N.Y · UCCL09177
- SLC to Karl Gerhardt, 20 September 1884 · New York, N.Y · UCCL01319
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