Sources: NN-BGC
- Samuel L. Clemens to Malcolm Townsend, 22 April 1867 · New York, N.Y · UCCL02444
- Samuel L. Clemens to Mary Mason Fairbanks, 26 and 27 November 1868 · Elmira, N.Y · UCCL02767
- Samuel L. Clemens to Francis E. Bliss, 1 February 1869 · Jacksonville, Ill · UCCL02446
- Samuel L. Clemens to Elisha Bliss, Jr., 11 March 1870 · Buffalo, N.Y · UCCL00443
- Samuel L. Clemens to Elisha Bliss, Jr., 18 July 1870 · Elmira, N.Y · UCCL00490
- Samuel L. Clemens to Elisha Bliss, Jr., 28 October 1870 · Buffalo, N.Y · UCCL00516
- Samuel L. Clemens to Elisha Bliss, Jr., 5 November 1870 · Buffalo, N.Y · UCCL00523
- Samuel L. Clemens to John Henry Riley, 2 December 1870 · Buffalo, N.Y · UCCL00547
- Samuel L. Clemens to Elisha Bliss, Jr., 17 December 1870 · Buffalo, N.Y · UCCL00550
- Samuel L. Clemens to Francis S. Drake, 26 December 1870 · Buffalo, N.Y · UCCL02790
- Samuel L. Clemens to James Redpath, 22 January 1871 · Buffalo, N.Y · UCCL00561
- Samuel L. Clemens to John Henry Riley, 3 March 1871 · Buffalo, N.Y · UCCL00582
- Samuel L. Clemens to Orion Clemens, 10 March 1871 · Buffalo, N.Y · UCCL02453
- Samuel L. Clemens to Elisha Bliss, Jr., 17 March 1871 · Buffalo, N.Y · UCCL02455
- Samuel L. Clemens to Henri Gerard, 5 May 1871 · Elmira, N.Y · UCCL02456
- Samuel L. Clemens to James Redpath, 15 September 1871 · Elmira, N.Y · UCCL02457
- Samuel L. Clemens to John Henry Riley, 9 October 1871 · Hartford, Conn · UCCL02458
- Samuel L. Clemens to John Henry Riley, 4 January 1872 · Dayton, Ohio · UCCL00706
- Samuel L. Clemens to William Dean Howells, 15 June 1872 · Hartford, Conn · UCCL00756
- Samuel L. Clemens to James Redpath, 18 July 1872 · New Saybrook, Conn · UCCL00769
- Samuel L. Clemens to Charles M. Underhill, 6 August 1872 · New Saybrook, Conn · UCCL08840
- Samuel L. Clemens to Olivia L. Clemens, 19 August 1872 · Hartford, Conn · UCCL00795
- Samuel L. Clemens to Michael Laird Simons, 27 and 28 January 1873 · Hartford, Conn · UCCL00868
- Samuel L. Clemens to Unidentified · UCCL00895
- Samuel L. Clemens to Elisha Bliss, Jr., 18 June 1873 · London, England · UCCL00928
- Samuel L. Clemens to George H. Fitzgibbon, 19 June 1873 · London, England · UCCL00929
- Samuel L. Clemens to George H. Fitzgibbon, 21 December 1873 · London, England · UCCL01012
- Samuel L. Clemens to George H. Fitzgibbon, 30 December 1873 · London, England · UCCL01020
- Samuel L. Clemens to Charles Warren Stoddard, 9 January 1874 · Liverpool, England · UCCL01037
- Samuel L. Clemens to William Dean Howells, 20 March 1874 · Hartford, Conn · UCCL02468
- Samuel L. Clemens to Jerome B. Stillson, 23 March 1874 · Hartford, Conn · UCCL02469
- Samuel L. Clemens to John Brown, 15 June 1874 · Elmira, N.Y · UCCL02470
- Samuel L. Clemens to the Editor of the Boston Advertiser, 16 June 1874 · Elmira, N.Y · UCCL02471
- Samuel L. Clemens to William A. Seaver, 2 or 3 July 1874 · Hartford, Conn · UCCL10803
- Samuel L. Clemens to William Dean Howells, 22 August 1874 · Elmira, N.Y · UCCL02472
- Samuel L. Clemens to William Dean Howells, 2 September 1874 · Elmira, N.Y · UCCL02473
- Samuel L. Clemens to William Dean Howells, 20 September 1874 · Hartford, Conn · UCCL02474
- Samuel L. Clemens to William Dean Howells, 24 October 1874 (second of 2) · Hartford, Conn · UCCL02476
- Samuel L. Clemens to William Dean Howells, 24 October 1874 (first of 2) · Hartford, Conn · UCCL02475
- Samuel L. Clemens to William Dean Howells, 20 November 1874 · Hartford, Conn · UCCL02478
- Samuel L. Clemens to William Dean Howells, 20 November 1874 · Hartford, Conn · UCCL02477
- Samuel L. Clemens to Jahu Dewitt Miller, 2? December 1874 · Hartford, Conn · UCCL09876
- Samuel L. Clemens to William Dean Howells, 8 December 1874 · Hartford, Conn · UCCL05257
- Samuel L. Clemens to William Dean Howells, 9 December 1874 · Hartford, Conn · UCCL02480
- Samuel L. Clemens to William Dean Howells, 13 December 1874 · Hartford, Conn · UCCL02481
- Samuel L. Clemens to William Dean Howells, 18 December 1874 · Hartford, Conn · UCCL02482
- Samuel L. Clemens to William Dean Howells, 26 January 1875 · Hartford, Conn · UCCL02483
- Samuel L. Clemens to Robert Watt, 26 January 1875 · Hartford, Conn · UCCL02484
- Samuel L. Clemens to William Dean Howells, 10 February 1875 · Hartford, Conn · UCCL02487
- Samuel L. Clemens to Elisha Bliss Jr., 12–28 February 1875 · Hartford, Conn · UCCL02486
- Samuel L. Clemens to Elinor M. and William Dean Howells, 14? February 1875 · Hartford, Conn · UCCL02485
- Samuel L. Clemens to William Dean Howells, 1 March 1875 · Hartford, Conn · UCCL02488
- Samuel L. Clemens to William Dean Howells, 23 April 1875 · Hartford, Conn · UCCL02489
- Samuel L. Clemens to William Dean Howells, 24 April 1875 · Hartford, Conn · UCCL02490
- Samuel L. Clemens to William Dean Howells, 25 June 1875 · Hartford, Conn · UCCL02491
- Samuel L. Clemens to William Dean Howells, 5 July 1875 · Hartford, Conn · UCCL01247
- Samuel L. Clemens to William Dean Howells, 13 July 1875 · Hartford, Conn · UCCL02492
- Samuel L. Clemens to William Dean Howells, 18 September 1875 · Hartford, Conn · UCCL02493
- Samuel L. Clemens to William Dean Howells, 19 October 1875 · Hartford, Conn · UCCL02495
- Samuel L. Clemens to William Dean Howells, 4 November 1875 · Hartford, Conn · UCCL02494
- Samuel L. Clemens to William Dean Howells, 23 November 1875 · Hartford, Conn · UCCL02496
- Samuel L. Clemens to William Dean Howells, 11 January 1876 · Hartford, Conn · UCCL02497
- Samuel L. Clemens to William Dean Howells, 18 January 1876 · Hartford, Conn · UCCL02498
- Samuel L. Clemens to William Dean Howells, 3 April 1876 · Hartford, Conn · UCCL02499
- Samuel L. Clemens to William Dean Howells, 22 April 1876 · Hartford, Conn · UCCL02500
- Samuel L. Clemens to William Dean Howells, 26 April 1876 · Hartford, Conn · UCCL02501
- Samuel L. Clemens to William Dean Howells, 4 May 1876 · Hartford, Conn · UCCL02502
- Samuel L. Clemens to William Dean Howells, 9 August 1876 · Elmira, N.Y · UCCL02503
- Samuel L. Clemens to William Dean Howells, 23 August 1876 · Elmira, N.Y · UCCL02504
- Samuel L. Clemens to William Dean Howells, 14 September 1876 · Hartford, Conn · UCCL02505
- Samuel L. Clemens to James B. Pond, 27 September 1876 · Hartford, Conn · UCCL02506
- Samuel L. Clemens to William Dean Howells, 11 October 1876 · Hartford, Conn · UCCL02508
- Samuel L. Clemens to James B. Pond, 11 October 1876 · Hartford, Conn · UCCL02507
- Samuel L. Clemens to William Dean Howells, 1 May 1877 · Baltimore, Md · UCCL01422
- Samuel L. Clemens to William Dean Howells, 29 May 1877 · Hartford, Conn · UCCL02509
- Samuel L. Clemens to William Dean Howells, 27 June 1877 · Elmira, N.Y · UCCL02510
- Samuel L. Clemens to William Dean Howells, 4 and 6 July 1877 · Elmira, N.Y · UCCL02511
- Samuel L. Clemens to William Dean Howells, 11 July 1877 · Elmira, N.Y · UCCL02512
- Samuel L. Clemens to William Dean Howells, 3 August 1877 · Elmira, N.Y · UCCL02513
- Samuel L. Clemens to William Dean and Elinor M. Howells, 25 and 27 August 1877 · Elmira, N.Y · UCCL02515
- Samuel L. Clemens to John Brown, 25 and 27 August 1877 · Elmira, N.Y · UCCL01473
- Samuel L. Clemens to William Dean Howells, 29 August 1877 · Elmira, N.Y · UCCL02516
- Samuel L. Clemens to William Dean Howells, 19 September 1877 · Hartford, Conn · UCCL02517
- Samuel L. Clemens to Charles Warren Stoddard, 28? October 1877 · (2nd of 5) · Hartford, Conn · UCCL09281
- Samuel L. Clemens to Thomas Nast, 12 November 1877 · Hartford, Conn · UCCL02518
- Samuel L. Clemens to Andrew Chatto, per Fanny C. Hesse, 10 December 1877 · Hartford, Conn · UCCL02519
- Samuel L. Clemens to William Dean Howells, 23 December 1877 · Hartford, Conn · UCCL02520
- Samuel L. Clemens to William Dean Howells, 28 December 1877 · Hartford, Conn · UCCL02521
- Samuel L. Clemens to William Dean Howells and Elinor M. Howells, 26 February 1878 · Hartford, Conn · UCCL02522
- Samuel L. Clemens to William Dean Howells, 4 May 1878 · Frankfurt on the Main, Germany · UCCL02523
- Samuel L. Clemens to William Dean Howells, 26 May 1878 · Heidelberg, Germany · UCCL02524
- Samuel L. Clemens to Frank Fuller, 20 August 1878 · Lucerne, Switzerland · UCCL02526
- Samuel L. Clemens to Francis E. Bliss, 20 August 1878 · Lucerne, Switzerland · UCCL02525
- Samuel L. Clemens to William Dean Howells, 17 November 1878 · Munich, Germany · UCCL02527
- Samuel L. Clemens to William Dean Howells, 21 January 1879 · Munich, Germany · UCCL02528
- Samuel L. Clemens to William Dean Howells, with a letter to Orion Clemens, 9 February 1879 · Munich, Germany · UCCL02529
- Samuel L. Clemens to George P. A. Healy, 25 March 1879 · Paris, France · UCCL02530
- Samuel L. Clemens to Francis E. Bliss, 15 April 1879 · Paris, France · UCCL02531
- Samuel L. Clemens to Andrew Chatto, 29 May 1879 · Paris, France · UCCL02532
- Samuel L. Clemens to Andrew Chatto, 19 August 1879 · Windermere, England · UCCL02533
- Samuel L. Clemens to William Dean Howells, 15 September 1879 · Elmira, N.Y · UCCL02534
- Samuel L. Clemens to William Dean Howells, 9 October 1879 · Elmira, N.Y · UCCL02535
- Samuel L. Clemens to Theodore W. Crane, 18 November 1879 · Hartford, Conn · UCCL02536
- Samuel L. Clemens to James B. Pond, 25 November 1879 · Hartford, Conn · UCCL10797
- Samuel L. Clemens to William Dean Howells, 28 November 1879 · Hartford, Conn · UCCL02537
- Samuel L. Clemens to William Dean Howells, 8 January 1880 · Hartford, Conn · UCCL02538
- Samuel L. Clemens to William Dean Howells, 11 March 1880 · Hartford, Conn · UCCL02539
- Samuel L. Clemens to Elisha Bliss, Jr., 20 March 1880 · Hartford, Conn · UCCL02540
- SLC to Chatto & Windus, 20 April 1880 · Hartford, Conn · UCCL02541
- Samuel L. Clemens to Moncure D. Conway, 20 and 21 April 1880 · Hartford, Conn · UCCL01787
- Samuel L. Clemens to William Dean Howells, 6 and 7 May 1880 · Hartford, Conn · UCCL02542
- Samuel L. Clemens to William Dean Howells, 9 June 1880 · 1st of 2 · Hartford, Conn · UCCL02543
- Samuel L. Clemens to William Dean Howells, 24 October 1880 · Hartford, Conn · UCCL02544
- Samuel L. Clemens to Mary Mapes Dodge, 19 November 1880 · Hartford, Conn · UCCL02545
- Samuel L. Clemens to William Dean Howells, 24 December 1880 · Hartford, Conn · UCCL02546
- Samuel L. Clemens to Edwin Pond Parker, 24 December 1880 · Hartford, Conn · UCCL02547
- Samuel L. Clemens to Susan L. Warner, 25 December 1880 · Hartford, Conn · UCCL08919
- SLC to William D. Howells, 21 February 1881 · Hartford, Conn · UCCL02549
- SLC to William D. Howells, 27 February 1881 · Hartford, Conn · UCCL02550
- SLC to James R. Osgood, 30 March 1881 · Hartford, Conn · UCCL02551
- SLC, OLC to Hattie J. Gerhardt, 7 August 1881 · Elmira, N.Y · UCCL02552
- SLC to William D. Howells, 26 October 1881 · Hartford, Conn · UCCL02553
- SLC to Charles W. Stoddard, 26 October 1881 · Hartford, Conn · UCCL02554
- SLC to James R. Osgood, 28 October 1881 · Hartford, Conn · UCCL02555
- SLC to Andrew Chatto, 11 November 1881 · Hartford, Conn · UCCL02556
- SLC to William D. Howells, 16 December 1881 · Hartford, Conn · UCCL02557
- SLC to Edwin Pond Parker, 20 December 1881 · Hartford, Conn · UCCL10807
- SLC to Clara Trowbridge, 20 December 1881 · Hartford, Conn · UCCL02558
- SLC to Susy (Olivia Susan) Clemens, 25 December 1881 · Hartford, Conn · UCCL10644
- SLC to James R. Osgood, 29 December 1881 · Hartford, Conn · UCCL02559
- SLC to William D. Howells, 28 January 1882 · Hartford, Conn · UCCL02560
- SLC to James R. Osgood, 4 March 1882 · Hartford, Conn · UCCL02561
- SLC to Chatto & Windus, 10 June 1882 · Hartford, Conn · UCCL02563
- SLC to William D. Howells, 22 June 1882 · Hartford, Conn · UCCL02564
- SLC to William D. Howells, 25 July–28 July 1882 · Elmira, N.Y · UCCL12010
- SLC to William D. Howells, 3 October 1882 · Hartford, Conn · UCCL02567
- SLC to Karl Gerhardt and Hattie J. Gerhardt, 23 October 1882 · Hartford, Conn · UCCL02565
- SLC to Chatto & Windus, 27 October 1882 · Hartford, Conn · UCCL02566
- SLC to William D. Howells, 4 November 1882 · Hartford, Conn · UCCL02568
- SLC to William D. Howells, 1 March 1883 · Hartford, Conn · UCCL02569
- SLC to Jenny Sharples, 1 May 1883 · Hartford, Conn · UCCL02570
- SLC to William D. Howells, 20 July 1883 · Elmira, N.Y · UCCL02571
- SLC to William D. Howells, 22 August 1883 · Elmira, N.Y · UCCL02572
- SLC to William D. Howells, 7 January 1884 · Hartford, Conn · UCCL02573
- SLC to William D. Howells, 2 February 1884 · Hartford, Conn · UCCL02576
- SLC to James B. Pond, 28 February 1884 · Hartford, Conn · UCCL02577
- SLC to William D. Howells, 8 April 1884 · Hartford, Conn · UCCL02578
- SLC to Unidentified, 11 May 1884 · Hartford, Conn · UCCL02579
- SLC to James B. Pond, 15 May 1884 · Hartford, Conn · UCCL02979
- SLC to James B. Pond, 3 July 1884 · Elmira, N.Y · UCCL02580
- SLC to James B. Pond, 8 July 1884 · Elmira, N.Y · UCCL02581
- SLC to James B. Pond, 15 July 1884 · Elmira, N.Y · UCCL02582
- SLC to James B. Pond, 23 July 1884 · Elmira, N.Y · UCCL08909
- SLC to James B. Pond, 28 July 1884 · Elmira, N.Y · UCCL02585
- SLC to William D. Howells, 31 August 1884 · Elmira, N.Y · UCCL02586
- SLC to William D. Howells, 17 September 1884 · Elmira, N.Y · UCCL02588
- SLC to William D. Howells, 17 September 1884 · Elmira, N.Y · UCCL02587
- SLC to James B. Pond, 20 September 1884 · Elmira, N.Y · UCCL02590
- SLC to James B. Pond, 26 September 1884 · Hartford, Conn · UCCL02591
- SLC to James B. Pond, 2 October 1884 · Hartford, Conn · UCCL02593
- SLC to James B. Pond, 11 October 1884 · Hartford, Conn · UCCL02594
- SLC to James B. Pond, 12 October 1884 · Hartford, Conn · UCCL02592
- SLC to James B. Pond, 15 October 1884 · Hartford, Conn · UCCL02595
- SLC to James B. Pond, 19 October 1884 · Hartford, Conn · UCCL02584
- SLC to James B. Pond, 22 October 1884 · Hartford, Conn · UCCL02596
- SLC to James B. Pond, 23 October 1884 · Hartford, Conn · UCCL02598
- SLC to James B. Pond, 24 October 1884 · Hartford, Conn · UCCL02597
- SLC to James B. Pond, 28 October 1884 · Hartford, Conn · UCCL03012
- SLC to James B. Pond, 31 October 1884 · Hartford, Conn · UCCL02599
- SLC to James B. Pond, 1 November 1884, Hartford, Conn · UCCL13329
- SLC to James B. Pond, 11 November 1884 · Boston, Mass · UCCL03023
- SLC to James B. Pond, 15 November 1884 · Boston, Mass · UCCL03025
- SLC to James B. Pond, 16 November 1884 · Hartford, Conn · UCCL02600
- SLC to James B. Pond, 19 November? 1884, New York, N.Y · UCCL13330
- SLC to James B. Pond, 22 December 1884 · Hartford, Conn · UCCL02601
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