Sources: CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 17 September 1864 · San Francisco, Calif · UCCL00086 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 14 July 1865 · San Francisco, Calif · UCCL11610 CLjC
- Samuel L. Clemens to W. C. Kimball and W. W. Kimball, 26 April 1866 · Island of Maui, Sandwich Islands · UCCL00098 CLjC
- Samuel L. Clemens to Emeline B. Beach, 31 January 1868 · Washington, D.C · UCCL00187 CLjC
- Samuel L. Clemens to Emeline B. Beach, 10 February 1868 · Washington, D.C · UCCL00192 Mn2, CLjC
- Samuel L. Clemens to Frank Fuller, 15 August 1868 · Hartford, Conn · UCCL02744 CLjC
- Samuel L. Clemens to Frank Fuller, 24 September 1868 · St. Louis, Mo · UCCL02753 CLjC
- Samuel L. Clemens to Frank Fuller, 5–30 October 1868 · Hartford, Conn · UCCL09079 CLjC
- Samuel L. Clemens to Edward L. Burlingame, 7 October 1868 · Hartford, Conn · UCCL02757 CLjC
- Samuel L. Clemens to Pamela A. Moffett, 29? November 1868 · New York, N.Y · UCCL02771 CLjC
- Samuel L. Clemens to Jervis Langdon, 29 December 1868 · Cleveland, Ohio · UCCL00212 Mo4, CLjC
- Samuel L. Clemens to Jane Lampton Clemens and Family, 26? March 1869 · Elmira, N.Y · UCCL00285 CLjC, Mac Donnell
- Samuel L. Clemens to A. Miner Griswold (Fat Contributor), 1 September 1869 · Buffalo, N.Y · UCCL11538 CLjC
- Samuel L. Clemens to Frank Fuller, 21 May 1870 · Buffalo, N.Y · UCCL00466 CU-MARK, CLjC
- Samuel L. Clemens to Elisha Bliss, Jr., 5 August 1870 · Elmira, N.Y · UCCL10994 CLjC
- Samuel L. Clemens to Iretus G. Cardner, 26 October 1870 · Buffalo, N.Y · UCCL00515 CLjC
- Samuel L. Clemens to Francis P. Church, 23 December 1870 · Buffalo, N.Y · UCCL02786 CLjC
- Samuel L. Clemens to Alfred B. Crandell and Other Members of the Farmers’ Club, 26 December 1870 · Buffalo, N.Y · UCCL02788 CLjC
- Samuel L. Clemens to James N. Gillis, 2 July 1871 · Elmira, N.Y · UCCL00631 CLjC
- Samuel L. Clemens to James Redpath and George L. Fall, 13 January 1872 (1st of 2) · Pittsburgh, Pa · UCCL00717 CLjC
- Samuel L. Clemens to Olivia L. Clemens, 12 October 1872 · London, England · UCCL00822 CLjC
- Samuel L. Clemens to Mary Hunter Smith, 10 December 1872 · Hartford, Conn · UCCL11669 CLjC
- Samuel L. Clemens to Olivia Lewis Langdon, 20 July 1873 · York, England · UCCL00955 CLjC
- Samuel L. Clemens to Henry Lee, 25 or 26 September 1873 · London, England · UCCL00965 CLjC
- Samuel L. Clemens to John Brown, 30 October 1873 · SS Batavia en route from Liverpool, England, to New York, N.Y · UCCL00978 CLjC
- Samuel L. Clemens to Elisha Bliss, Jr., 19 February 1874 · Hartford, Conn · UCCL01052 CLjC
- Samuel L. Clemens to Mr. McElroy, 10 March 1874 · Hartford, Conn · UCCL11635 CLjC
- Samuel L. Clemens to Editor of the New York Evening Post, 25 June 1874 · Elmira, N.Y · UCCL00934 CLjC
- Samuel L. Clemens to Frank Fuller, 6 September 1874 · Elmira, N.Y · UCCL01124 WU-MU, CLjC
- Samuel L. Clemens to James R. Osgood, 20 February 1875 · Hartford, Conn · UCCL11540 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 1 May 1875 · Hartford, Conn · UCCL01273 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 17 September 1875 · Hartford, Conn · UCCL11612 CLjC
- Samuel L. Clemens to To William Wright (Dan De Quille) per Unidentified Stenographer, 5 January 1876 · Hartford, Conn · UCCL01296 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 28 January 1876 · Hartford, Conn · UCCL01304 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 8 February 1876 · Hartford, Conn · UCCL01305 CLjC
- Samuel L. Clemens to William Wright (Dan De Quille), 29 November 1876 · Hartford, Conn · UCCL02466 CLjC
- Samuel L. Clemens to Miss Holmes, 13 April 1877 · Hartford, Conn · UCCL11456 CLjC
- Samuel L. Clemens to Richard Edwards, per Olivia L. Clemens, 16 July 1877 · Elmira, N.Y · UCCL11826 CLjC
- Samuel L. Clemens to Margaret C. Avery, November 1877 · Hartford, Conn · UCCL12465 CLjC
- Samuel L. Clemens to Andrew Chatto, 3 June 1878 · Heidelberg, Germany · UCCL01567 CLjC
- Samuel L. Clemens to William A. Seaver, 28 June 1878 · Heidelberg, Germany · UCCL01574 CLjC
- Samuel L. Clemens to Francis E. Bliss, 13 July 1878 · Heidelberg, Germany · UCCL01576 CLjC
- Samuel L. Clemens to Olivia L. Clemens, 26 August 1878 · St. Niklaus, Switzerland · UCCL01590 CLjC
- Samuel L. Clemens to Daniel Slote, 4 September 1879 · Elmira, N.Y · UCCL10434 CLjC
- Samuel L. Clemens to Francis E. Bliss, 8 September 1879 · Elmira, N.Y · UCCL01684 CLjC
- Samuel L. Clemens to Frank Fuller, 22 November 1879 · Hartford, Conn · UCCL01723 NFred, CLjC
- Samuel L. Clemens to Frank Fuller, 5 December 1879 · Hartford, Conn · UCCL01733 CLjC
- Samuel L. Clemens to Frank Fuller, 19 December 1879 · Hartford, Conn · UCCL01742 CLjC
- Samuel L. Clemens to Frank Fuller per Telegraph Operator, 30 October 1880 · Hartford, Conn · UCCL01849 CLjC
- SLC to OLC, 7 June 1881 · Hartford, Conn · UCCL01839 CLjC, CU-MARK
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 31 August 1881 · Elmira, N.Y · UCCL02019 CLjC, MB
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 24 February 1882 · Hartford, Conn · UCCL02165 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 21 March 1882 · Hartford, Conn · UCCL02177 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 23 March 1882 · Hartford, Conn · UCCL02179 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 1 June 1882 · Hartford, Conn · UCCL02210 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 25 January–6 February 1883 · Hartford, Conn · UCCL10134 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 26 March 1883 · Hartford, Conn · UCCL02364 CLjC
- SLC to James R. Osgood, 6 April 1883 · Hartford, Conn · UCCL02803 CLjC
- SLC to Henry C. Robinson, 11 July 1883 · Elmira, N.Y · UCCL11235 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 20 July 1883 · Elmira, N.Y · UCCL11182 CLjC
- SLC to Charles L. Webster, 30 October 1883 · Hartford, Conn · UCCL11181 CLjC
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 5 March 1884 · Hartford, Conn · UCCL02926 CLjC
- SLC to Andrew Chatto, 1 April 1884 · Hartford, Conn · UCCL11941 CLjC
- SLC to Unidentified, 5 August 1884 · Elmira, N.Y · UCCL09177 CLjC
- SLC to Karl Gerhardt, 20 September 1884 · New York, N.Y · UCCL01319 CLjC
- SLC to Charles Casey, 11 March 1885 · Hartford, Conn · UCCL03187 CLjC
- SLC to Jesse R. Grant, 4 July 1885 · Elmira, N.Y · UCCL10672 CLjC
- SLC to Karl Gerhardt, 5 July 1885 · Elmira, N.Y · UCCL03251 CLjC
- SLC to Jay H. Gibson, 12 July 1886 · Elmira, N.Y · UCCL10671 CLjC
- SLC to Charles D. Warner, 22 July 1886 · Elmira, N.Y · UCCL10349 CLjC
- SLC to Andrew Chatto, 12 August 1886 · Elmira, N.Y · UCCL12175 CLjC
- SLC to Clara L. Spaulding, 20 August 1886 · Elmira, N.Y · UCCL03442 CLjC, CU-MARK
- SLC to Karl Gerhardt, 7 October 1886 · Hartford, Conn · UCCL11541 CLjC
- SLC to William Smith, 15 December 1886 · Hartford, Conn · UCCL11176 CLjC, NCGU
- SLC to Richard Watson Gilder, 31 January 1887 · Hartford, Conn · UCCL11427 CLjC
- SLC to Cordelia W. Foote, 2 December 1887 · Hartford, Conn · UCCL03672 CLjC
- SLC to Franklin G. Whitmore, 25 August 1888 · Elmira, N.Y · UCCL11428 CLjC, TxAu3
- Bradford Merrill for Philadelphia Press to SLC · UCLC50644 CLjC
- SLC to Edward H. House, 2 March 1889 · Hartford, Conn · UCCL12176 CLjC
- SLC to Frank Fuller, 5? March 1889 · Hartford, Conn · UCCL11430 CLjC
- SLC to Unidentified, 11 April 1889 · Hartford, Conn · UCCL11426 CLjC
- SLC to Clara L. Clemens, 15 July 1889 · Hartford, Conn · UCCL03911 CLjC, PL1
- SLC to Joseph T. Goodman, 29 November 1889 · Hartford, Conn · UCCL03980 CLjC
- SLC to Philadelphia Press, Unknown date · Unknown place · UCCL11481 CLjC
- SLC to Dean Sage, 5 February 1890 · Hartford, Conn · UCCL04012 CLjC
- SLC to Andrew Chatto, 10 March 1890 · Hartford, Conn · UCCL11429 CLjC, CU-MARK
- SLC to Telephone Co., 15 January–15 February 1891 · Hartford, Conn · UCCL12234 CLjC
- SLC to Richard Watson Gilder, 19 October 1892 · Florence, Italy · UCCL09229 CLjC
- SLC to Henry M. Alden, 24 November 1892 · Florence, Italy · UCCL09770 CLjC
- SLC to Frederick J. Hall, 1 January 1893 · Florence, Italy · UCCL04318 CLjC
- SLC to Unidentified, 2 July 1893 · Munich, Germany · UCCL11945 CLjC
- SLC to William W. Ellsworth, 15 September 1893 · New York, N.Y · UCCL11341 CLjC
- SLC to Unidentified, 19 September 1893 · New York, N.Y · UCCL09425 CLjC
- SLC to OLC, 26 September 1893 · New York, N.Y · UCCL04461 CLjC
- SLC to Helena Gilder, 17 February 1894 · New York, N.Y · UCCL12055 CLjC
- SLC to Millicent Library, 22 February 1894 · Fairhaven, Mass · UCCL04696 CLjC, MFai
- SLC to Miss Bronson, 4 July 1894 · La Bourboule, France · UCCL04751 CLjC
- SLC to Susy (Olivia Susan) Clemens, 8 August 1894 · New York, N.Y · UCCL04776 CLjC
- SLC to Lloyd S. Bryce, 30 November 1894 · Paris, France · UCCL04816 CLjC
- SLC to Clara L. Spaulding, 2 July 1895 · Elmira, N.Y · UCCL04924 CLjC
- SLC to J. Henry Harper, 21 August 1895 · Victoria, Canada · UCCL04956 CLjC
- SLC to Jack Harrington, 28 August 1895 · RMS Warrimoo, en route from Victoria, Canada, to Sydney, Australia · UCCL11651 CLjC, AuCNL
- SLC to Miss Buckley, 15 September 1895 · Melbourne, Australia · UCCL04961 CLjC
- SLC to Andrew Chatto, 19 August 1896 · Guildford, England · UCCL11942 CLjC
- SLC to Francis E. Bliss, 3 November 1897 · Vienna, Austria · UCCL05305 CLjC
- SLC to Richard Watson Gilder, 7 May 1898 · Kaltenleutgeben, Austria · UCCL05386 CLjC
- SLC to Francis E. Bliss, 18 June 1898 · Kaltenleutgeben, Austria · UCCL11197 CLjC
- SLC to Kate S. Littlewood, 5 August 1898 · Kaltenleutgeben, Austria · UCCL08818 CLjC
- SLC to Edward W. Bok, 26 September 1898 · Vienna, Austria · UCCL11468 CLjC
- SLC to Francis E. Bliss, 27 February 1899 · Vienna, Austria · UCCL05552 CLjC
- SLC to John Brisben Walker, 5 April 1899 · Vienna, Austria · UCCL11586 CLjC
- SLC to Samuel G. Blythe, 12 February 1900 · London, England · UCCL11587 CLjC
- SLC to Canon Wiberforce, 17 April 1900 · London, England · UCCL12177 CLjC
- SLC to J. Y. W. MacAlister, 1–3 October 1900 · London, England · UCCL05874 CLjC
- SLC to Unidentified, 30 November 1900 · New York, N.Y · UCCL05922 CLjC
- SLC to Edmund C. Stedman, 12 December 1900 · New York, N.Y · UCCL05930 CLjC
- SLC to Plasmon Co., 29 January 1901 · New York, N.Y · UCCL12227 CLjC
- SLC to John W. Lloyd, 8 March ?1901 · New York, N.Y · UCCL13252 CLjC
- SLC to Virginia F. Boyle, 16 September 1901 · Saranac Lake, N.Y · UCCL06137 CLjC
- SLC to Plasmon Co., 10 April 1902 · Riverdale, N.Y · UCCL06321 CLjC
- SLC to Elisabeth Brachmann, 14 April 1902 · Riverdale, N.Y · UCCL10673 CLjC
- SLC to Katharine I. Harrison, 26 April 1902 · Riverdale, N.Y · UCCL06330 CLjC
- SLC to Klaw and Erlanger, 7 August 1902 · York Harbor, Me · UCCL12225 CLjC
- SLC to Barbara Mullen, 12 December 1902 · Riverdale, N.Y · UCCL06514 CLjC
- SLC to William Digby, 14 January 1903 · Riverdale, N.Y · UCCL11680 CLjC
- SLC to Frederick A. Duneka, 15 June 1903 · Riverdale, N.Y · UCCL06678 CLjC
- SLC per Clara L. Clemens to Frances R. Massiglia, 18 January 1904 · Florence, Italy · UCCL11739 CLjC
- SLC to Mrs. Jordan Mott, 12 April 1904 · Florence, Italy · UCCL11196 CLjC
- SLC to Charles D. Burrage, 11 February 1905 · New York, N.Y · UCCL11195 CLjC
- SLC to Clara L. Clemens, 18 June 1905 · Dublin, N.H · UCCL07063 CLjC
- SLC to Clara L. Clemens, 29 June 1905 · Dublin, N.H · UCCL07073 CLjC
- SLC to Virginia F. Boyle, 16 July 1905 · Dublin, N.H · UCCL07086 CLjC
- SLC to Helena Gilder, 28 July 1905 · Dublin, N.H · UCCL12056 CLjC
- SLC to Norman Hapgood, 18? September 1905 · Dublin, N.H · UCCL07123 CLjC
- SLC to Clara L. Clemens, 3 October 1905 (2nd of 2) · Dublin, N.H · UCCL11367 CLjC, CU-MARK
- SLC to Alice W. Pearmain, 7 November 1905 · New York, N.Y · UCCL12665 CLjC
- SLC to Gertrude Natkin, 18 February 1906 · Unknown place · UCCL12546 CLjC
- SLC to Govinier C. Hall, 24 February 1906 · New York, N.Y · UCCL12178 CLjC
- SLC to Clara L. Clemens, 2–3 October 1906 · Dublin, N.H · UCCL07533 CLjC
- SLC per Isabel V. Lyon to Mrs. ? Caverly, 17 December 1906 · New York, N.Y · UCCL12233 CLjC
- SLC to Jean L. Clemens, 25 February 1907 · New York, N.Y · UCCL07664 CLjC
- SLC to Jean Clemens, 5 March 1907 · New York, N.Y · UCCL07670 CLjC
- SLC to Catherine Gregory, 6 April 1907 · New York, N.Y · UCCL13007 CLjC
- SLC to Clara L. Clemens, 2 May 1907 · New York, N.Y · UCCL07705 CLjC
- SLC to Jean Clemens, 14 May 1907 · Tuxedo Park, N.Y · UCCL07720 CLjC
- SLC to Jean Clemens, 23 June 1907 · London, England · UCCL07767 CLjC
- SLC to Clara L. Clemens, 30 June 1907 · London, England · UCCL07773 CLjC
- SLC to New York Herald, 4 July 1907 · London, England · UCCL11974 CLjC
- SLC to Jean Clemens, 4 July 1907 · London, England · UCCL07778 CLjC
- SLC to Jean Clemens, 12 July 1907 · London, England · UCCL07782 CLjC
- SLC to Clara L. Clemens, 12 July 1907 · London, England · UCCL07783 CLjC, MiD
- SLC to Helena Gilder, 11 February 1908 · New York, N.Y · UCCL12063 CLjC
- SLC to Dorothea Gilder, 11 February 1908 · New York, N.Y · UCCL12581 CLjC
- SLC to Jean Clemens, 20 May 1908 · New York, N.Y · UCCL08005 CLjC
- SLC to Jean Clemens, 21 May 1908 · New York, N.Y · UCCL08006 CLjC
- SLC to Jean Clemens, 5 June 1908 · New York, N.Y · UCCL08021 CLjC
- SLC to Jean Clemens, 14 June 1908 · New York, N.Y · UCCL08028 CLjC
- SLC to Jean L. Clemens, 2 July 1908 · Redding, Conn · UCCL08051 CLjC, CU-MARK
- SLC to Jean Clemens, 28 July 1908 · Redding, Conn · UCCL08062 CLjC
- SLC to Jean Clemens, 9 August 1908 · Redding, Conn · UCCL08077 CLjC
- SLC to Amelia Dunne Hookway, October 1908 · Redding, Conn · UCCL08096 CLjC, CU-MARK
- SLC to Jean Clemens, 2 October 1908 · Redding, Conn · UCCL08118 CLjC
- SLC to Archibald Henderson, 21 December 1908 · Redding, Conn · UCCL11526 CLjC
- SLC to Jean Clemens, 19 April 1909 · Redding, Conn · UCCL08385 CLjC
- SLC to Amelia Dunne Hookway, 5 June 1909 · Redding, Conn · UCCL12230 CLjC
- SLC to Amelia Dunne Hookway, 7 June 1909 · Redding, Conn · UCCL12231 CLjC
- SLC to the Printer, 26 December 1909 · Redding, Conn · UCCL11212 CLjC
- SLC to Henry H. Rogers, Unknown date · Unknown place · UCCL09018 CLjC
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