Sources: CtY
- Samuel L. Clemens to President of the Scroll and Key Society, 18 November 1868 · Cleveland, Ohio · UCCL02764
- Samuel L. Clemens to James Redpath, 10 May 1869 · Hartford, Conn · UCCL00298
- Samuel L. Clemens to William D. Whitney, 16 January 1875 · Hartford, Conn · UCCL08610
- SLC to Elisha Bliss, Jr., 12 February–31 March 1875 · Hartford, Conn · UCCL11061
- Samuel L. Clemens to Elisha Bliss, Jr., 16? July 1875 · Hartford, Conn · UCCL01252
- SLC to George A. Townsend, 26 February 1880 · Hartford, Conn · UCCL08598
- SLC to Benjamin H. Ticknor, 9 September 1881 · Elmira, N.Y · UCCL02032
- SLC to Unidentified, 19 September 1881 · Elmira, N.Y · UCCL02040
- SLC to Henry B. Barnes, 25 January 1885 · Minneapolis, Minn · UCCL03133
- SLC to Karl Gerhardt, 11 July 1885 · Elmira, N.Y · UCCL03258
- SLC to Unidentified, 30 July 1885 · Elmira, N.Y · UCCL11047
- SLC to Annie E. Trumbull, 4 November 1885 · New York, N.Y · UCCL11018
- SLC to Benjamin H. Ticknor, 12 November 1885 · Hartford, Conn · UCCL03306
- SLC to Joseph H. Twichell and Harmony C. Twichell, 24 December 1885 · Hartford, Conn · UCCL03342
- SLC to ? Handy, 29 December 1885 · Hartford, Conn · UCCL03348
- SLC to Annie E. Trumbull, 4 May–5 May 1888 · Hartford, Conn · UCCL11037
- SLC per Franklin G. Whitmore to Francis E. Bliss, 9 October 1888 · Hartford, Conn · UCCL03787
- SLC to Unidentified, 10 April 1889 · Hartford, Conn · UCCL03882
- SLC to Unidentified, 30 April 1889 · Hartford, Conn · UCCL11046
- SLC to Edmund C. Stedman, 18 May 1889 · Hartford, Conn · UCCL03894
- SLC to Walt Whitman, 24 May 1889 · Hartford, Conn · UCCL03895
- SLC to Joseph T. Goodman, 19 November 1889 · Hartford, Conn · UCCL03970
- SLC to Joseph T. Goodman, 4 December 1889 · Hartford, Conn · UCCL03982
- SLC to L. E. Parkhurst, 20 December 1889 · Hartford, Conn · UCCL03991
- SLC to Joseph T. Goodman, 18 April 1890 · Hartford, Conn · UCCL04041
- SLC to Annie E. Trumbull, 28 April 1890 · Hartford, Conn · UCCL11019
- SLC to Annie E. Trumbull, 27 September 1890 · Hartford, Conn · UCCL10998
- SLC to Joseph T. Goodman, 23 October 1890 · Hartford, Conn · UCCL04105
- SLC to Annie E. Trumbull, 11 January 1891 · Hartford, Conn · UCCL11021
- SLC to Merriam (G.&C.) Co., 7 March 1891 · Hartford, Conn · UCCL04178
- SLC to John Horne, May 1891 · Hartford, Conn · UCCL09307
- SLC to Annie E. Trumbull, 31 May 1891 · Hartford, Conn · UCCL11020
- SLC to Annie E. Trumbull, 9 January 1892 · Ilsenburg, Germany · UCCL11022
- SLC, OLC to Annie E. Trumbull, 8 March 1892 · Menton, France · UCCL11023
- SLC to Joseph H. Twichell, 25 April 1892 · Rome, Italy · UCCL04285
- SLC to Sarah A. Trumbull, 18 July 1892 · Bad Nauheim, Germany · UCCL11017
- SLC to Francis E. Bliss, 31 October 1892 · Florence, Italy · UCCL08926
- SLC to Henry C. Robinson, 13 November 1892 · Florence, Italy · UCCL11049
- SLC to Henry C. Robinson, 20 July 1893 · Krankenheil, Germany · UCCL11050
- SLC to Annie E. Trumbull, 14 January 1894 · New York, N.Y · UCCL11031
- OLC to Annie E. Trumbull, 25 January 1894 · Paris, France · UCCL10999
- SLC to Frederick J. Hall, 31 March 1894 · Paris, France · UCCL04715
- SLC to Chatto & Windus, 2 July 1894 · La Bourboule, France · UCCL05251
- SLC to Henry C. Robinson, 23 July 1894 · New York, N.Y · UCCL11051
- SLC to Lloyd S. Bryce, 13 October 1894 · Rouen, France · UCCL04797
- SLC to Henry C. Robinson, 29 November 1894 · Paris, France · UCCL11053
- SLC to Francis E. Bliss, 9 December 1894 · Paris, France · UCCL04820
- OLC to American Publishing Co., 1 July 1895 · Elmira, N.Y · UCCL04919
- OLC to Annie E. Trumbull, 19 August 1895 · Vancouver, Canada · UCCL11036
- SLC to Charles H. Webb, 16 February 1896 · Darjeeling, India · UCCL05021
- SLC to Henry C. Robinson, 4 July 1896 · Cape Town, South Africa · UCCL11052
- SLC to Annie E. Trumbull, 4 July 1896 · Cape Town, South Africa · UCCL11032
- SLC to American Publishing Co., 24 March 1897 · London, England · UCCL05189
- SLC to Joseph H. Twichell, 8 July 1897 · London, England · UCCL05258
- OLC to Eliza N. Robinson, 28 January 1898 · Vienna, Austria · UCCL05219
- SLC to Francis E. Bliss, 28 August 1898 · Kaltenleutgeben, Austria · UCCL05424
- SLC to Henry M. Alden, 2 November 1898 · Vienna, Austria · UCCL05456
- SLC to Richard Watson Gilder, 6–13 November 1896 · Vienna, Austria · UCCL05459
- SLC to Joseph H. Twichell, 3 January 1899 · Vienna, Austria · UCCL05533
- SLC to Joseph H. Twichell, May 1899 · Vienna, Austria · UCCL05599
- SLC to Joseph H. Twichell, 1 June 1899 · London, England · UCCL05637
- SLC to Joseph H. Twichell, 3 July 1899 · London, England · UCCL05647
- SLC to Unidentified, 3 August 1899 · Sanna, Sweden · UCCL11044
- SLC to Joseph H. Twichell, 6 September 1899 · Sanna, Sweden · UCCL05672
- SLC to Francis H. Skrine, 15 September 1899 · Sanna, Sweden · UCCL05676
- SLC to Harper & Brothers, 1 October 1899 · London, England · UCCL11064
- SLC to Unidentified, 8 November 1899 · London, England · UCCL11045
- SLC to Joseph H. Twichell, 21 November 1899 · London, England · UCCL05713
- SLC to Franklin G. Whitmore, 21 December 1899 · London, England · UCCL05721
- SLC to Francis E. Bliss, 25 April 1900 · London, England · UCCL11058
- SLC to Joseph H. Twichell, 18 August 1900 · London, England · UCCL05855
- SLC to John Brisben Walker, 27 September 1900 · London, England · UCCL05872
- SLC to Francis E. Bliss, 25 October 1900 · New York, N.Y · UCCL05885
- SLC to Thomas R. Lounsbury, 20 November 1900 · New York, N.Y · UCCL05915
- SLC to William L. Phelps, 24 April 1901 · New York, N.Y · UCCL06044
- SLC to Joseph H. Twichell, 24 April 1901 · New York, N.Y · UCCL06046
- SLC to George B. Harvey, 4 May 1901 · New York, N.Y · UCCL06052
- SLC per F. A. R. to Frank Parsons, 6 May 1901 · New York, N.Y · UCCL09119
- SLC to Francis E. Bliss, 14 May 1901 · New York, N.Y · UCCL06056
- SLC to Francis E. Bliss, 20 May 1901 · New York, N.Y · UCCL11060
- SLC to Merriam (G.&C.) Co., 26 July 1901 · Saranac Lake, N.Y · UCCL06096
- SLC to Joseph H. Twichell, 29 September 1901 · New York, N.Y · UCCL06146
- SLC to Muriel M. Pears, 4 December 1901 · Riverdale, N.Y · UCCL06182
- SLC to Henry W. Fischer, 3 January 1902 · Riverdale, N.Y · UCCL06217
- SLC to Joseph H. Twichell, 4 January 1902 · Riverdale, N.Y · UCCL06220
- Clara L. Clemens to Muriel M. Pears, 21 January 1902 · Riverdale, N.Y · UCCL06251
- SLC to Muriel M. Pears, 14 February 1902 · Riverdale, N.Y · UCCL06276
- SLC to Francis E. Bliss, 15 February 1902 · Riverdale, N.Y · UCCL06278
- SLC to Muriel M. Pears, 21 June 1902 · Riverdale, N.Y · UCCL06372
- SLC to Joseph H. Twichell, 30 September 1902 · York Harbor, Me · UCCL06448
- SLC to Joseph H. Twichell, 31 December1902–1 January 1903 · Riverdale, N.Y · UCCL06534
- SLC to Joseph H. Twichell, 3–4 January 1903 · Riverdale, N.Y · UCCL06548
- SLC per Isabel V. Lyon to George B. Harvey, 12 January 1903 · Riverdale, N.Y · UCCL06556
- SLC to Muriel M. Pears, 14 January 1903 · Riverdale, N.Y · UCCL06560
- SLC to Joseph H. Twichell, 28 January 1903 · Riverdale, N.Y · UCCL06573
- SLC per Isabel V. Lyon to Francis E. Bliss, 25 February 1903 · Riverdale, N.Y · UCCL06585
- SLC to American Publishing Co., 28 April 1903 · Riverdale, N.Y · UCCL06635
- SLC to Francis E. Bliss, 11 May 1903 · Riverdale, N.Y · UCCL06655
- SLC to Annie E. Trumbull, 16 June 1903 · Riverdale, N.Y · UCCL11033
- SLC to Harriet E. Whitmore, 18 July 1903 · Elmira, N.Y · UCCL06702
- OLC to Annie E. Trumbull, 20 July 1903 · Elmira, N.Y · UCCL11034
- SLC to Joseph H. Twichell, 21 July 1903 · Elmira, N.Y · UCCL06704
- SLC to Francis E. Bliss, 29 July 1903 · Elmira, N.Y · UCCL06715
- SLC to Joseph H. Twichell, 1 September 1903 · Elmira, N.Y · UCCL06722
- SLC, OLC to American Publishing Co., 23 October 1903 · New York, N.Y · UCCL06754
- SLC to Muriel M. Pears, 4 January 1904 · Florence, Italy · UCCL06781
- SLC to Muriel M. Pears, 9 May 1904 · Florence, Italy · UCCL06831
- SLC to Joseph H. Twichell, 8 June 1904 · Florence, Italy · UCCL06867
- SLC to Muriel M. Pears, 21 June 1904 · Florence, Italy · UCCL06848
- SLC to Thomas R. Lounsbury, 21 July 1904 · Lee, Mass · UCCL06896
- SLC to Joseph H. Twichell, 28 July 1904 · Lee, Mass · UCCL06906
- SLC to Joseph H. Twichell, 16 February 1905 · New York, N.Y · UCCL07001
- SLC to Muriel M. Pears, 18 February 1905 · New York, N.Y · UCCL07002
- SLC to Muriel M. Pears, 13 March 1905 · New York, N.Y · UCCL07017
- SLC to Joseph H. Twichell, 24 June 1905 · Dublin, N.H · UCCL07069
- SLC to Joseph H. Twichell, 13 July 1905 · Dublin, N.H · UCCL07082
- SLC to Muriel M. Pears, 26 July 1905 · Dublin, N.H · UCCL07090
- SLC to Muriel M. Pears, 11 October 1905 · Dublin, N.H · UCCL07172
- SLC to Joseph H. Twichell, 14 September 1906 · Dublin, N.H · UCCL07524
- Clara L. Clemens to Muriel M. Pears, 29 June 1908 · London, England · UCCL08043
- SLC to Unidentified, Unknown date · Unknown place · UCCL11043
- SLC to Unidentified, Unknown date · Unknown place · UCCL11042
- SLC to Unidentified, Unknown date · Unknown place · UCCL11041
- SLC to Joseph H. Twichell, Unknown date · Unknown place · UCCL09020
- SLC to Eliza N. Robinson, Unknown date, Hartford, Conn · UCCL11056
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