2023-08-03: Hannibal, Huck, and Tom (1973).

2024-02-06: Added 69 newly edited Clemens letters from January through March 1884.

2023-10-23: Added 37 newly edited Clemens letters from October through December 1883.

2023-08-03: What is Man? (1973).

2023-06-21: Added 44 newly edited Clemens letters from July through September 1883.

2023-04-20: Added 50 newly edited Clemens letters from April through June 1883.

2023-03-28: Added 62 newly edited Clemens letters from January through March 1883.

2023-02-08: Added Early Tales & Sketches, Volume 2 (1864-1865). Fixes to 1876-1877 letters.

2022-12-20: Added Early Tales & Sketches, Volume 1 (1851-1864)

2022-11-03: Updated and added annotations to previously published letters from June-December 1876 and June-December 1877.

2022-05-25: Updated and added annotations to previously published letters from February-May 1876 and March through May 1877.

2022-03-31: Updated previously published letters from January 1876 and January through February 1877 to align with content in forthcoming Letters Volume 7.

2022-02-28: Added 47 newly edited Clemens letters from October through December 1882.

2022-01-20: Added 49 newly edited Clemens letters from July through September 1882.

2021-12-21: Added 48 newly edited Clemens letters from April through June 1882.

2021-11-23: Added 59 newly edited Clemens letters from January through March 1882

2021-10-25: Added 132 newly edited Clemens letters from September through December 1881 .

2021-09-08: Added 84 newly edited Clemens letters from May through August 1881 . And new letter text for SLC to Moncure D. Conway, 25 June 1873, London, England (UCCL 00932) based on a recently discovered manuscript

2021-07-12: Added 85 newly edited Clemens letters from January through April 1881

2020-08-03: Added A Connecticut Yankee in King Arthur's Court; minor fixes to page layout in works released since late 2019; corrected typographical errors on landing page.

2020-01-27: Added Fables of Man and Which Was the Dream?; updates to website.

2019-12-12: Added Mysterious Stranger Manuscripts; updates to website.

2019-11-19: Added Prince and the Pauper; minor corrections to letters.

2018-11-08: Letters update, including numerous additions and corrections; newly cataloged and transcribed letters include those spanning the years 1853 through 1869. These include letters not previously published in the project's print volumes or online. They also include updated transcriptions of letters previously published but for which we now have more authoritative sources. See UCCL 02713, 00022, 00049, 12723, 13643, 00080, 10786, 11531, 12616, 10643, 09996, 12724, 00199, 00020, 02731, 12727, 02748, 13338, 02757, 02729, 02777, 09449, 00212, 11632, 00233, 00288, 12512, 00371, 13069, 00376, 13483; Numerous corrections to bibliographic references in letters and works.

2016-06-27: Comprehensive update of Bibliographic Resources; minor update of Technical Summary; Letters update, including numerous additions and corrections; newly cataloged letters include UCCL 13731, 13732, 13733, 13735, 13736, 13737, 13738, 13739, 13740, 13741, 13742, 13743, 13744, 13745, 13746, 13747, 13748, 13749, 13750, 13751, 13752, 13753, 13754, 13755, 13756, 13758, 13759, 13760, and 13761, plus UCLC 50911, 50913, 50915, 50916, 50917, 50918, 50919, 50921, 50922, 50923, 50924, 50925, 50926, 50927, 50928, 50929, 50930, 50931, 50932, 50933, 50934, 50935, 50936, 50937, 50938, 50939, 50940, 50941, 50942, 50943, 50944, 50945, 50946, 50947, 50948, 50949, 50950, 50951, 50952, 50953, 50954, 50955, 50956, 50957, 50958, 50959, 50960, 50961, 50962, 50963, 50964, 50965, 50966, 50967, 50968, 50969, 50970, 50971, 50972, 50973, 50974, 50975, 50976, 50977, 50978, 50979, 50980, 50981, 50982, 50983, 50984, 50985, 50986, 50987, 50988, 50989, 50990, 50991, 50992, 50993, 50994, 50995, 50996, 51001, 51003, 51004, 51005, 51006, 51007, 51008, 51009, 51010, 51011, 51012, 51013, 51014, 51015, 51016, 51017, 51018, 51019, 51020, 51021, 51022, 51023, 51024, 51025, 51026, 51027, 51028, 51030, 51031, 51032; the following records have been retired: 11120, 11121, 11122, 11458, 11695, 12029, 47490, 48142, 48582, 48834, 49417, 49552, 49911, 49943

2016-06-06: Roughing It (1993) released, containing all materials in the printed book published by UC Press; update of Bibliographic Resources; corrections and enhancements throughout site, particularly for Print View; References section added to Adventures of Huckleberry Finn, plus the book's silent, belated conversion from P4 to P5 (i.e., now all writings on site use P5)

2015-10-19: Autobiography of Mark Twain, Volume 3 released, containing all materials in the printed book published by UC Press, plus the extensive textual apparatus, as well as edited text and facsimile of Clemens's working notes for "The Ashcroft-Lyon Manuscript"; link to NEH@50 honor added

2015-07-27: Placeholder page added for Autobiography of Mark Twain, Vol. 3; corrections and enhancements throughout site; newly cataloged letters include UCCL 13708, 13709, 13710, 13711, 13712, 13713, 13714, 13715, 13716, 13717, 13718, 13719, 13720, 13721, 13722, 13723, 13724, 13725, 13726, 13727, 13728, 13729, 13730, plus UCLC 50903, 50904, 50905, 50906, 50907, 50908, 50909, 50910

2015-04-20: References section added to Huck Finn and Tom Sawyer among the Indians, and Other Unfinished Stories, page numbers added to it and Note on the Text, and the book's silent, belated conversion from P4 to P5

2015-03-31: Comprehensive Letters update, including numerous additions and corrections as well as a partial metadata changelog; newly cataloged letters include UCCL 11367, 13551, 13627, 13628, 13629, 13630, 13631, 13632, 13633, 13634, 13635, 13636, 13637, 13638, 13639, 13640, 13641, 13642, 13643, 13644, 13645, 13646, 13647, 13648, 13649, 13650, 13651, 13652, 13653, 13654, 13655, 13656, 13657, 13658, 13659, 13660, 13661, 13662, 13663, 13664, 13665, 13666, 13667, 13668, 13669, 13670, 13671, 13672, 13673, 13674, 13675, 13676, 13677, 13678, 13679, 13680, 13682, 13683, 13684, 13686, 13687, 13688, 13689, 13690, 13691, 13692, 13693, 13694, 13695, 13696, 13699, 13700, 13701, 13702, 13703, 13704, 13705, 13706, and 13707, plus UCLC 50665, 50666, 50667, 50668, 50669, 50670, 50671, 50672, 50673, 50674, 50675, 50676, 50677, 50678, 50679, 50680, 50681, 50682, 50683, 50684, 50685, 50686, 50687, 50688, 50689, 50690, 50691, 50692, 50693, 50694, 50695, 50696, 50697, 50698, 50699, 50700, 50701, 50702, 50703, 50704, 50705, 50706, 50707, 50708, 50709, 50710, 50711, 50712, 50713, 50714, 50715, 50716, 50717, 50718, 50719, 50720, 50721, 50722, 50723, 50724, 50725, 50726, 50727, 50728, 50729, 50730, 50731, 50732, 50733, 50734, 50735, 50736, 50737, 50738, 50739, 50740, 50741, 50742, 50743, 50744, 50745, 50746, 50747, 50748, 50749, 50750, 50751, 50752, 50753, 50754, 50755, 50756, 50757, 50758, 50759, 50760, 50761, 50762, 50763, 50764, 50765, 50766, 50767, 50768, 50769, 50770, 50771, 50772, 50773, 50774, 50775, 50776, 50777, 50778, 50779, 50780, 50781, 50782, 50783, 50784, 50785, 50786, 50787, 50788, 50789, 50790, 50791, 50792, 50793, 50794, 50795, 50796, 50797, 50798, 50799, 50800, 50801, 50802, 50803, 50804, 50805, 50806, 50807, 50808, 50809, 50810, 50811, 50812, 50813, 50814, 50815, 50816, 50817, 50818, 50819, 50820, 50821, 50822, 50823, 50824, 50825, 50826, 50827, 50828, 50829, 50830, 50831, 50832, 50833, 50834, 50835, 50836, 50846, 50847, 50848, 50849, 50850, 50851, 50852, 50853, 50854, 50855, 50856, 50857, 50858, 50859, 50860, 50861, 50862, 50863, 50864, 50865, 50866, 50867, 50868, 50869, 50870, 50871, 50872, 50873, 50874, 50875, 50876, 50877, 50878, 50879, 50880, 50881, 50882, 50883, 50884, 50885, 50886, 50887, 50888, 50889, 50890, 50891, 50892, 50893, 50894, 50895, 50896, 50897, 50898, 50899, 50900, 50901, 50902; the following records have been retired: 07011, 11466, 12591, 12833, 41487, 43592, 44971, 48127, 48229, 48238, 48265, 48329, 48330, 48332, 48333, 48813, 48843, 50560

2014-04-07: Comprehensive Letters update, including numerous additions and corrections; newly cataloged letters include UCCL 13565, 13572, 13573, 13574, 13575, 13576, 13577, 13578, 13579, 13580, 13581, 13582, 13583, 13584, 13585, 13586, 13587, 13588, 13589, 13590, 13591, 13592, 13593, 13594, 13595, 13596, 13597, 13598, 13599, 13600, 13601, 13602, 13603, 13605, 13606, 13607, 13608, 13609, 13610, 13611, 13612, 13613, 13614, 13615, 13616, 13617, 13618, 13619, 13620, 13621, 13622, 13623, 13624, 13625, and 13626, plus UCLC 50649, 50650, 50651, 50652, 50653, 50655, 50656, 50657, 50658, 50659, 50660, 50661, 50662, 50663, 50664; the following records have been retired: 09877, 10188, 11457, 12902, 13422, 37618, 43622, 47492, 48850, 48851, 48863, 48880, 49027, 50566, 50568, 50570, 50572, 50574, 50575, 50577, 50579, 50580, 50581, 50583, 50584, 50586, 50587; corrected misidentification of USC donor Jeanne Hutchings in UCCL 11875, 11876, 11877, and 11913

2014-02-26: Enhanced cross-reference links from AutoMT2 to AutoMT1; supplied scan of formatting table for the Letters Guide to Editorial Practice

2013-11-18: Comprehensive Letters update, including numerous additions and corrections as well as a partial metadata changelog; newly cataloged letters include UCCL 08622, 13425, 13446, 13453, 13455, 13456, 13458, 13459, 13460, 13465, 13469, 13470, 13473, 13489, 13493, 13495, 13496, 13497, 13498, 13499, 13500, 13501, 13502, 13504, 13506, 13507, 13508, 13509, 13510, 13511, 13512, 13513, 13514, 13515, 13516, 13517, 13519, 13520, 13521, 13522, 13523, 13524, 13525, 13526, 13527, 13528, 13529, 13530, 13531, 13532, 13533, 13535, 13536, 13537, 13538, 13540, 13541, 13542, 13543, 13544, 13545, 13546, 13547, 13548, 13549, 13550, 13552, 13554, 13555, 13556, 13557, 13558, 13559, 13560, 13561, 13562, 13563, 13564, 13566, 13567, 13568, 13569, 13570, and 13571, plus UCLC 49724, 50620, 50621, 50623, 50624, 50625, 50626, 50627, 50628; added skeleton P5 TEI-XML sample of AutoMT2; strengthened cross-reference link support within AutoMT2 and entered minor encoding corrections

2013-10-05 (officially): Autobiography of Mark Twain, Volume 2 released, containing all materials in the printed book published by UC Press, plus the extensive textual apparatus; it is our first TEI-based release to use a P5-based schema and thus brings myriad invisible XSL changes to support it

2013-08-12: Reference and Source Interface added to Resources, with support for search as well as faceted browse; choosing Prev or Next section in Writings remembers the Citations On|Off setting; for facets site-wide, "More" link works reliably with quoted strings and italics; minor corrections entered for references

2013-02-25: Source Format facet added to Letters catalog, and format now included in UCCL Details as part of the Repository and Printed Version fields; minor corrections entered for catalog entries, as well as minor adjustments to bibliographical and biographical authority references in edited letters

2012-12-17: “Mark Twain on the Platform” added, with information about his lectures and reading tours across four decades: table, map, and timeline are driven by Simile Exhibit; Resources area brought to fore to spotlight extant as well as new ancillary materials; Place of Origin facet added to Letters catalog, together with numerous additions and corrections to catalog entries; Contributor Credits updated

2012-06-05: Newly Recovered Letters, Part 1 renamed retroactively to Letters Newly Published 1; Editorial Status facet renamed to MTPO Texts, and improved; extant electronic title page for Letters given greater visibility

2012-05-18: Comprehensive Letters update, including numerous additions and corrections, the addition of an Editorial Status facet, and a partial metadata changelog; minor corrections entered for several dozen letter texts

2012-03-02: Minor corrections entered for Adventures of Huckleberry Finn (i.e., not in the 2003 edition), in agreement with the 2010 Mark Twain Library edition: explanatory notes to 192.25–26 and 199.15; minor corrections entered for a dozen letters

2011-12-09: All textual commentaries for Autobiography of Mark Twain, Volume 1 supplied as 413-page PDF concatenation; they continue to be available in HTML

2011-10-14: Infrastructure added for displaying two or more published versions of a letter text (see e.g. UCCL 00340)

2011-09-16: Keyword-in-context (KWIC) result toggle added to Letters; works best with text-based searches, e.g. howells

2011-08-08: Corrected placement of some explanatory note markers throughout Autobiography of Mark Twain, Volume 1

2011-06-21: JavaScript bug fixed that impeded cross-reference links originating in the note pane; page anchors added to Huck and Tom among the Indians (1989) (formerly 1–261, 299–351; now 1–351) and Adventures of Huckleberry Finn (2003) (formerly 1–362, 622–54; now 1–834, 994–1117: we regret that "Emendations and Historical Collation" cannot be paginated due to its encoding)

2011-05-26: Corrections entered to Autobiography of Mark Twain, Volume 1 (2010) to match those applied to the printed edition

2011-05-16: Corrections to annotation entered for five letters, four of which now recognize Frank Fuller’s second wife, Mrs. Annie Fuller: UCCL 02768, 02785, 01041, 01071, 01107

2010-11-29: Images Catalog launched with small initial set of scanned photographs, search feature, browsable facets, and sortable and gallery views

2010-10-18: Autobiography of Mark Twain, Volume 1 released, containing all materials in the printed book published by UC Press, plus approximately 200 pages’ worth of textual apparatus, as well as a color scan of the 23 Dec 1905 Harper’s Weekly special issue (accompanying the “Speech at the Seventieth Birthday Dinner” appendix)

2010-10-15: Twenty-eight new letter texts 1872–75 released under the aggregate title Newly Recovered Letters, Part 1 for a total of fifty-four, listed chronologically here—UCCL 12774, 12657, 12784, 11981, 13094, 12773, 12791, 12655, 12311, 12163, 12436, 12698, 12793, 12794, 12795, 12797, 12798, 12800, 12805, 12806, 12807, 12808, 12816, 13001, 12799, 12741, 13107, 12878; note: extant annotation for related letters may be affected but has not been revised at this time

2010-10-01: Letters catalog changes: serials and monographs added to catalogs under the Printed Version facet; to improve searchability, facet labels with "&" use "and"; letter IDs may be retrieved with or without entry of their UCCL/UCLC prefix; in result and detail views, compound letter dates display in full

2010-08-16: Twenty-six new letter texts 1862–71 released under the aggregate title Newly Recovered Letters, Part 1 and listed chronologically here—UCCL 12722, 11953, 12725, 12724, 12726, 10494, 11419, 12104, 12467, 12761, 12762, 12763, 12765, 12766, 12767, 12486, 12768 (with UCLC 50387), 12769, 12355, 13009, 12771, 12094, 12650, 12952, 12772, 12656; note: extant annotation for related letters may be affected but has not been revised at this time

2010-08-12: 361 Letters catalog entries added (102 incoming, 259 outgoing); widespread catalog corrections released, including refinements to date written, expanded addressee names, newly identified senders and addressees

2010-08-01: Letter text replaced for UCCL 00340, which is released under the aggregate title Newly Recovered Letters, Part 1; note: extant annotation for related letters may be affected but has not been revised at this time

2010-07-28: Video clip commissioned by UC Press embedded in User Guide

2010-05-12: Corrections to paragraph indention in more than 200 letters, primarily 1876–1880

2010-03-28: Minor changes to static pages, including the home page

2009-10-05: Autobiography sample added; biography of Patrick McAleer corrected

2009-05-01: UC Press imprint and MLA/CSE seal added

2009-04-02: Minor corrections to layout (inline salutations) entered for 36 letters, 1853–1880; recipient identified for UCCL 12963

2008-12-03: Minor corrections entered for Adventures of Huckleberry Finn (i.e., not in the 2003 edition): explanatory notes to 1.13 and 357.7–8; in Introduction, pp. 738–40, nn. 225–30 and p. 773, n. 337

2009-02-26: New letter text—UCCL 01062; facsimile view added for UCCL 12720

2009-02-24: Illustrative images added to ten letters 1876–1880 (CU-MARK and courtesy CLjC, MoHH, TxU-HU, ViU): UCCL 01590, 01777, 01792, 01794, 01862, 09288, 11304, 11805, 12465, 12477

2009-02-05: Minor corrections to text, annotation, and/or apparatus entered for 97 letters; also included: UCCL 01489's enclosure and an illustrative image for UCCL 11304 (courtesy KyHi)

2009-01-20: Four new letter texts—UCCL 13079, 13081, 13093, 13105

2008-10-29: Annotation amended for 6 Feb 1870 to Bowen, to add cross-reference to Huck Finn and Tom Sawyer among the Indians