Sources: CtY-BR
- Samuel L. Clemens to Francis Bret Harte, 1 May 1867 · New York, N.Y · UCCL00128
- Samuel L. Clemens to Frank Fuller, 7 August 1867 · Naples, Italy · UCCL00142
- Samuel L. Clemens to Frank Fuller, 5 December 1867 · Washington, D.C · UCCL00170
- Samuel L. Clemens to Joseph H. and Harmony C. Twichell, 18 November 1868 · Cleveland, Ohio · UCCL02765
- Samuel L. Clemens to Francis E. Bliss, 7 January 1869 · Chicago, Ill · UCCL00221
- Samuel L. Clemens to Harriet Lewis, 10 January 1869 · Galesburg, Ill · UCCL00226
- Samuel L. Clemens to Elisha Bliss, Jr., 15 April 1869 · Elmira, N. Y · UCCL00283
- Samuel L. Clemens to Elisha Bliss, Jr., 22 July 1869 · Elmira, N.Y · UCCL00327
- OLC to Joseph H. and Harmony C. Twichell, 31 October 1869 · Elmira, N. Y · UCCL00369
- Samuel L. Clemens to Joseph H. Twichell, 28 December 1869 · New York, N.Y · UCCL00395
- Samuel L. Clemens to John Fuller, 8 February 1870 · Buffalo, N.Y · UCCL00421
- Samuel L. Clemens to Elisha Bliss, Jr., per Olivia L. Clemens, with revisions by Samuel L. Clemens, 30 May 1870 · Buffalo, N.Y · UCCL00473
- Samuel L. Clemens to Joseph H. and Harmony C. Twichell, 12 November 1870 · Buffalo, N.Y · UCCL00533
- Samuel L. Clemens to Elisha Bliss, Jr., 22 November 1870 · Buffalo, N.Y · UCCL00542
- Samuel L. Clemens to Joseph H. Twichell, 19 December 1870 · Buffalo, N.Y · UCCL02783
- Samuel L. Clemens to A. Francis Judd, 20 December 1870 · Buffalo, N.Y · UCCL02784
- Samuel L. Clemens to John R. Drake, 26 December 1870 · Buffalo, N.Y · UCCL02789
- Samuel L. Clemens to John Henry Riley, 27 March 1871 · Elmira, N.Y · UCCL00597
- SLC to Unidentified, 14 May 1871 · Elmira, N.Y · UCCL09296
- Samuel L. Clemens to Elisha Bliss, Jr., 21 March 1872 · Elmira, N. Y · UCCL00738
- Samuel L. Clemens to Francis E. Bliss, 15 May 1872 · Elmira, N. Y · UCCL00749
- Samuel L. Clemens to Elisha Bliss, Jr., 7 August 1872 · New Saybrook, Conn · UCCL00787
- Samuel L. Clemens to The Editor of the Literary World, December 1872 · Hartford, Conn · UCCL00836
- Samuel L. Clemens to Joseph L. Twichell, 20–22 December · Hartford, Conn · UCCL00848
- Samuel L. Clemens to Elisha Bliss, Jr., 25 February 1873 · Hartford, Conn · UCCL00875
- Samuel L. Clemens to Willard M. White, 3 March 1873 · Hartford, Conn · UCCL00880
- Samuel L. and Olivia L. Clemens to Joseph H. Twichell, 29 June 1873 · London, England · UCCL00936
- Samuel L. Clemens to Joaquin Miller, 5 July 1873 · London, England · UCCL00945
- Samuel L. Clemens to Elisha Bliss, Jr. per Samuel C. Thompson, 16 July 1873 · London, England · UCCL00953
- Samuel L. Clemens to Charles Dudley Warner, per Samuel C. Thompson, 16 July 1873 · London, England · UCCL00954
- Samuel L. Clemens to T. B. Pugh, 27 July 1873 · Edinburgh, Scotland · UCCL00957
- Samuel L. Clemens to Elisha Bliss, Jr., 27 July 1873 · Edinburgh, Scotland · UCCL00956
- Samuel L. Clemens to Louisa P. MacDonald, 29 September 1873 · 2nd of 2 · London, England · UCCL11830
- Samuel L. Clemens to James Redpath, 13 February 1874 · Hartford, Conn · UCCL02450
- Samuel L. Clemens to John Brown, 28 February 1874 · Hartford, Conn · UCCL01056
- Samuel L. Clemens to Elisha Bliss, Jr., 22 May 1874 · Elmira, N. Y · UCCL01093
- Samuel L. Clemens to Joseph H. and Harmony C. Twichell, 11 June 1874 · Elmira, N.Y · UCCL01097
- Samuel L. Clemens to Joseph H. Twichell, 29? July 1874 · Elmira, N.Y · UCCL01113
- Samuel L. Clemens to William Dean Howells, 13 November 1874 · New Boston, Conn · UCCL01167
- Samuel L. Clemens to Densmore, Yost and Company, 19 March 1875 · Hartford, Conn · UCCL01212
- Samuel L. Clemens to James R. Osgood, 20 July 1875 · Hartford, Conn · UCCL01251
- Samuel L. Clemens to Joseph H. Twichell, 29 or 30 December 1875 · Hartford, Conn · UCCL01291
- Samuel L. Clemens to Elisha Bliss, Jr., 19 March 1876 · Hartford, Conn · UCCL01315
- Samuel L. Clemens to Elisha Bliss, Jr., 17? April 1876 · Hartford, Conn · UCCL01322
- Samuel L. Clemens to Elisha Bliss, Jr., 24 June 1876 · Elmira, N.Y · UCCL01345
- Samuel L. Clemens to Lewis Jacob Cist, 1 August 1876 · Elmira, N.Y · UCCL01353
- Samuel L. Clemens to Bayard Taylor, 24 January 1877 · Hartford, Conn · UCCL01403
- Samuel L. Clemens to Joseph H. Twichell, 27 June 1877 · Elmira, N.Y · UCCL01444
- Samuel L. Clemens to George Haven Putnam, 16 March 1878 · Hartford, Conn · UCCL01544
- Samuel L. Clemens to Joseph H. Twichell, 10 April 1878 · Elmira, N.Y · UCCL01554
- Samuel L. Clemens to Charles Dudley Warner, 1? August 1878 · Baden Baden?, Germany · UCCL01581
- Samuel L. and Olivia L. Clemens to Joseph H. Twichell, 9 September 1878 · Geneva, Switzerland · UCCL02800
- Samuel L. Clemens to Joseph H. Twichell, 3 November 1878 · Rome, Italy · UCCL01603
- Samuel L. Clemens to Joseph H. Twichell and Susan L. Warner, 20 November 1878 · Munich, Germany · UCCL01608
- Samuel L. Clemens to Joseph H. Twichell, 23 January 1879 · Munich, Germany · UCCL01624
- Samuel L. Clemens to Joseph H. Twichell, 10 June 1879 · Paris, France · UCCL01666
- Samuel L. Clemens to Joseph H. Twichell, 2 October 1879 · Elmira, N.Y · UCCL01696
- Samuel L. Clemens to Joseph Blackburn Jones, 7 November 1879 · Hartford, Conn · UCCL01710
- SLC to Unidentified, 14 March 1880 · Hartford, Conn · UCCL09309
- Samuel L. Clemens to Joseph H. Twichell, 16 March 1880 · Hartford, Conn · UCCL01771
- Samuel L. Clemens to Elisha Bliss, Jr., 21 April 1880 · Hartford, Conn · UCCL01788
- Samuel L. Clemens to Miss Perkins, 30 April 1880 · Hartford, Conn · UCCL01796
- Samuel L. Clemens to Unidentified, June 1880 · Hartford, Conn · UCCL11048
- Samuel L. Clemens to Joseph H. Twichell, per Telegraph Operator, 14 October 1880 · Boston, Mass · UCCL01841
- SLC to Unidentified, May 1881 · Hartford, Conn · UCCL09314
- SLC to Osgood (J.R.) & Co., 2 July 1881 · Branford, Conn · UCCL01980
- SLC to Benjamin H. Ticknor, 1 August 1881 · Branford, Conn · UCCL01992
- SLC to Benjamin H. Ticknor, 11 August 1881 · Elmira, N.Y · UCCL02000
- SLC to Benjamin H. Ticknor, 14 August 1881 · Elmira, N.Y · UCCL02006
- SLC to James R. Osgood, 21 October 1881 · Hartford, Conn · UCCL02058
- SLC to Joseph H. Twichell, 18? February 1882 · Hartford, Conn · UCCL02132
- SLC to Andrew Chatto, 3 March 1882 · Hartford, Conn · UCCL02169
- SLC to James R. Osgood, 19 July 1882 · Elmira, N.Y · UCCL02238
- SLC to Joseph H. Twichell, 19 September 1882 · Elmira, N.Y · UCCL02271
- SLC to George MacDonald, 19 September 1882 · Elmira, N.Y · UCCL02270
- SLC to James R. Osgood, 15 January 1883 · Hartford, Conn · UCCL02334
- SLC to American Publishing Co., 17 May 1883 · Hartford, Conn · UCCL02387
- OLC to Sarah A. Trumbull, 26 December 1883 · Hartford, Conn · UCCL11038
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 4 May 1884 · Hartford, Conn · UCCL02969
- SLC to Joseph H. Twichell, 16 September 1884 · Elmira, N.Y · UCCL01327
- SLC to Charles L. Webster, 23 November 1884 · New York, N.Y · UCCL03036
- SLC to Karl Gerhardt, 6 July 1885 · Elmira, N.Y · UCCL03253
- SLC to Joseph H. Twichell, 1-15 December 1885, Hartford, Conn · UCCL03321
- SLC to Henry B. Barnes, 20 November 1886 · Hartford, Conn · UCCL03483
- SLC to Henry B. Barnes, 6 December 1886 · Hartford, Conn · UCCL03493
- SLC to Joseph H. Twichell, 14 March 1887 · Hartford, Conn · UCCL03539
- SLC to Richard Watson Gilder, 28 September 1887 · Hartford, Conn · UCCL03654
- SLC to W. M. Bunn, 23 December 1887 · Hartford, Conn · UCCL03681
- SLC to Joseph H. Twichell, 28 June 1888 · Elmira, N.Y · UCCL03726
- SLC to Joseph H. Twichell, 25 January 1889 · Hartford, Conn · UCCL03853
- SLC to Francis Wayland, 28 February 1889 · Hartford, Conn · UCCL14029
- SLC to Joseph T. Goodman, 7 October 1889 · Hartford, Conn · UCCL03948
- SLC, OLC to Annie E. Trumbull, 15 December–31 December 1889 · Hartford, Conn · UCCL10997
- SLC to Joseph T. Goodman, 23 June 1890 · Hartford, Conn · UCCL04053
- OLC to Sarah A. Trumbull, 31 May 1891 · Hartford, Conn · UCCL11039
- SLC to Joseph H. Twichell, 1 October 1891 · Nimes, France · UCCL04241
- SLC to Unidentified, August 1892 · Unknown place · UCCL09304
- SLC to Annie E. Trumbull, 26 April 1893 · New York, N.Y · UCCL11025
- SLC to Annie E. Trumbull, 30 April 1893 · New York, N.Y · UCCL11024
- SLC to Annie E. Trumbull, 11 May 1893 · New York, N.Y · UCCL12374
- SLC to Annie E. Trumbull, 16 May 1893 · SS Kaiser Wilhelm · UCCL11030
- SLC to Robert Louis Stevenson, 3 June 1893 · Settignano, Italy · UCCL13312
- SLC to Joseph H. Twichell, 9 June 1893 · Florence, Italy · UCCL04412
- SLC to Joseph H. Twichell, 20 November 1893 · New York, N.Y · UCCL04508
- SLC to Annie E. Trumbull, 6 December 1893 · New York, N.Y · UCCL11029
- SLC to Annie E. Trumbull, 14 December 1893 · New York, N.Y · UCCL11028
- SLC to Annie E. Trumbull, 17 December 1893 · New York, N.Y · UCCL11026
- SLC to Frank Fuller, 1 February 1894 · New York, N.Y · UCCL04683
- OLC to Annie E. Trumbull, 18 January 1895 · Paris, France · UCCL11035
- SLC to Unidentified, 8 November 1895 · Dunedin, New Zealand · UCCL09667
- SLC to Joseph H. Twichell, 29 November 1895 · Napier, New Zealand · UCCL04977
- SLC to Henry C. Robinson, 28 September 1896 · London, England · UCCL05120
- SLC to Henry C. Robinson, 8 November 1896 · London, England · UCCL11054
- SLC to Joseph H. Twichell, 19 and 20 January 1897 · London, England · UCCL05169
- SLC to Francis E. Bliss, 26 March 1897 · London, England · UCCL05191
- SLC to Joseph H. Twichell, 10 April 1897 · London, England · UCCL05201
- SLC to Joseph H. Twichell, 31 July 1897 · Weggis, Switzerland · UCCL05275
- SLC to Francis E. Bliss, 4 November 1897 · Vienna, Austria · UCCL05307
- SLC to Joseph H. Twichell, 19 November 1897 · Vienna, Austria · UCCL05314
- SLC to Percy Spalding, 20 November 1897 · Vienna, Austria · UCCL05315
- SLC to Francis E. Bliss, 26 November 1897 · Vienna, Austria · UCCL05316
- SLC to Joseph H. Twichell, 10 December 1897 · Vienna, Austria · UCCL05319
- SLC, OLC to Henry C. Robinson, 13 January 1898 · Vienna, Austria · UCCL11123
- SLC to Richard Watson Gilder, 2 April 1898 · Vienna, Austria · UCCL05373
- SLC to Joseph H. Twichell, 25 September 1898 · Unknown place · UCCL12889
- SLC to Richard Watson Gilder, 25 February 1899 · Vienna, Austria · UCCL05548
- SLC to Richard Watson Gilder, 23 July 1899 · Sanna, Sweden · UCCL05657
- SLC to Richard Watson Gilder, 22 August 1899 · Sanna, Sweden · UCCL05663
- Samuel L. Clemens to Henry Ferguson, 20 November 1899 . London, England · UCCL13204
- Samuel L. Clemens to Henry Ferguson, 21 December 1899 . London, England · UCCL13205
- Samuel L. Clemens to Henry Ferguson, 19 January 1900 . London, England · UCCL13206
- SLC to Lucius Robinson, 16 February 1900 · London, England · UCCL05759
- SLC to Francis E. Bliss, 22 February 1900 · London, England · UCCL05760
- Samuel L. Clemens to Henry Ferguson, 4 March 1900 . London, England · UCCL13207
- SLC to Francis E. (Frank) Bliss, 30 March 1900 · London, England · UCCL05786
- SLC to Bertha K. von Suttner, 7 May 1900 · London, England · UCCL05588
- SLC to Joseph H. Twichell, 22 and 23 June 1900 · London, England · UCCL05825
- SLC to Joseph H. Twichell, 12 August 1900 · London, England · UCCL05849
- SLC to Joseph H. Twichell, 23 and 24 January 1901 · New York, N.Y · UCCL05982
- SLC to Francis E. Bliss, 27 March 1901 · New York, N.Y · UCCL06026
- SLC to Joseph H. Twichell, 4, 11, or 18 June 1901 · New York, N.Y · UCCL06068
- SLC to Joseph H. Twichell, 28 July 1901 · Saranac Lake, N.Y · UCCL06098
- SLC to Joseph H. Twichell, 8 September 1901 · Saranac Lake, N.Y · UCCL06132
- SLC to Helen L. Stokes, 1 November 1901 · Riverdale, N.Y · UCCL08609
- SLC to George B. Harvey, 8 March 1902 · Riverdale, N.Y · UCCL06292
- SLC to Francis E. Bliss, 12 March 1902 · Riverdale, N.Y · UCCL06296
- SLC to Thomas R. Lounsbury, 10 April 1902 · Riverdale, N.Y · UCCL06320
- OLC to Sarah A. Trumbull, 19 May 1902 · Riverdale, N.Y · UCCL11040
- SLC to Joseph H. Twichell, 25 or 26? September 1902 · York Harbor, Me · UCCL06423
- SLC to Joseph H. Twichell, 11 October 1902 · York Harbor, Me · UCCL06450
- SLC to Muriel M. Pears, 13 October 1902 · York Harbor, Me · UCCL06460
- SLC to Muriel M. Pears, 15 December 1902 · Riverdale, N.Y · UCCL06517
- SLC to Joseph H. Twichell, 4 April 1903 · Riverdale, N.Y · UCCL06614
- SLC to Joseph H. Twichell, 9 October 1903 · New York, N.Y · UCCL06737
- SLC to Muriel M. Pears, 17 October 1903 · New York, N.Y · UCCL06744
- SLC to William Winter, 20 July 1904 · Lee, Mass · UCCL06892
- SLC to Joseph H. Twichell, 23 October 1904 · New York, N.Y · UCCL06934
- SLC to Joseph H. Twichell, 28 October 1904 · New York, N.Y · UCCL06940
- SLC to Joseph H. Twichell, 4 November 1904 · New York, N.Y · UCCL06945
- SLC to Susan L. Crane, 23 November 1904 · New York, N.Y · UCCL06955
- SLC to Kate D. Riggs, 9 December 1905 · New York, N.Y · UCCL07246
- SLC per Isabel V. Lyon to Yale Chapter Phi Beta Kappa Society, 3 March 1906 · New York, N.Y · UCCL11057
- SLC to Joseph H. Twichell, 15 or 16 September 1906 · Dublin, N.H · UCCL07523
- SLC to Maude Adams, 24 December 1906 · New York, N.Y · UCCL10937
- SLC to Joseph H. Twichell, 26 January 1907 · New York, N.Y · UCCL07636
- SLC to Harriet E. Whitmore, 7 February 1907 · New York, N.Y · UCCL07645
- SLC to Florence D. Jones, 27 May 1907 · Tuxedo Park, N.Y · UCCL07732
- SLC to William D. Howells, 4 October 1907 · Tuxedo Park, N.Y · UCCL07845
- SLC to Jean L. Clemens, 4 October 1907 · Tuxedo Park, N.Y · UCCL07843
- SLC to Elinor Glyn, 24 January 1908 · New York, N.Y · UCCL07929
- SLC to Margaret Blackmer, 2 March 1908 · Hamilton, Bermuda · UCCL07954
- SLC to Margaret Blackmer, 14 April 1908 · New York, N.Y · UCCL07974
- SLC to Margaret Blackmer, 15 April 1908 · New York, N.Y · UCCL07975
- SLC to Margaret Blackmer, 25 May 1908 · New York, N.Y · UCCL08009
- SLC to Margaret Blackmer, 20 June 1908 · Redding, Conn · UCCL08039
- SLC to Margaret Blackmer, 7 July 1908 · Redding, Conn · UCCL08049
- SLC to James M. Barrie, Aiugust 1908, Redding, Conn · UCCL12456
- SLC to Margaret Blackmer, 13 August 1908 · Redding, Conn · UCCL08084
- SLC to Fred V. Christ, 28 August 1908 · Redding, Conn · UCCL08092
- SLC to Margaret Blackmer, 18 September 1908 · Redding, Conn · UCCL08106
- SLC to Margaret Blackmer, 6 October–9 October 1908 · Redding, Conn · UCCL08123
- SLC to Margaret Blackmer, 14 October 1908 · Redding, Conn · UCCL08127
- SLC to Margaret Blackmer, 24 October–29 October 1908 · Redding, Conn · UCCL08143
- SLC to William Ireland Starr, 29 November 1908 · Redding, Conn · UCCL10790
- SLC to Margaret Blackmer, 6 December 1908 · Redding, Conn · UCCL07372
- SLC to Margaret Blackmer, 20 December–21 December 1908 · Redding, Conn · UCCL08134
- SLC to Margaret Blackmer, 3 January 1909 · Redding, Conn · UCCL08307
- SLC to Margaret Blackmer, 5 February 1909 · Redding, Conn · UCCL08341
- SLC to Margaret Blackmer, 20 February 1909 · Redding, Conn · UCCL08352
- SLC to Helen K. Blackmer, 3 March 1909 · Redding, Conn · UCCL08359
- SLC to Helen K. Blackmer, 13 March 1909 · Redding, Conn · UCCL08373
- SLC to Joseph H. Twichell, 23 June 1909 · Redding, Conn · UCCL08425
- SLC to Margaret Blackmer, 15 September 1909 · Redding, Conn · UCCL08453
- SLC to Joseph H. Twichell, 19 September–27 September 1909 · Redding, Conn · UCCL08454
- SLC to William Henry Bishop, 11 October 1909 · Redding, Conn · UCCL08466
- SLC to Helen K. Blackmer, 13 October 1909 · Redding, Conn · UCCL08468
- SLC to Helen K. Blackmer, 30 October 1909 · Redding, Conn · UCCL08481
- SLC to Margaret Blackmer, 18 November 1909 · Redding, Conn · UCCL08495
- Jean Clemens to William L. Phelps, 13 December 1909 · Redding, Conn · UCCL08509
- SLC to Margaret Blackmer, 26 December–15 January 1910 · Hamilton, Bermuda · UCCL08541
- SLC to Joseph H. Twichell and Harmony C. Twichell, 27 December 1909 · Redding, Conn · UCCL08525
- SLC to Margaret Blackmer, 26 January 1910 · Hamilton, Bermuda · UCCL08551
- SLC to Annie E. Trumbull, 27 April n.y. · Hartford, Conn · UCCL12373
- SLC to Unidentified, Unknown date, Elmira, N.Y · UCCL08132
- SLC to Eliza N. Robinson, Unknown date, Hartford, Conn · UCCL11056
- SLC to Annie E. Trumbull, Unknown date · Unknown place · UCCL11027
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