| AAC | “At the Appetite Cure” | 1W | * |
| AC | The American Claimant | 1W | |
| AMT | The Autobiography of Mark Twain | 1W | |
| AS | Ah Sin (play) | 1W | |
| ATS | “A True Story” | 1W | * |
| BA | Mark Twain's Burlesque Autobiography | 1W | |
| CC | “Concerning Chambermaids” | 1W | * |
| CHA | “Chapters from My Autobiography” (in the North American Review) | 1W | * |
| CM | “Answer to an Inquiry from the Coming Man” (in The Galaxy) | 1W | |
| CS | Christian Science | 1W | |
| CT | “The Californian's Tale” | 1W | * |
| CTJ | “Concerning the Jews” | 1W | * |
| CY | A Connecticut Yankee in King Arthur's Court | 1W | |
| DBDS | The Double-Barrelled Detective Story | 1W | |
| DGF | “A Defense of General Funston” | 1W | |
| DPC | “Diplomatic Pay and Clothes” | 1W | * |
| EAP | “How I Edited an Agricultural Paper” | 1W | |
| ED | Eve's Diary | 1W | |
| EMGB | “Edward Mills and George Benton” | 1W | * |
| EMR | “The Esquimau Maiden's Romance” | 1W | * |
| EWI | “An Encounter with an Interviewer” | 1W | |
| FE | Following the Equator | 1W | * |
| FL | “My First Lie, and How I Got Out of It” | 1W | * |
| GBC | “The Facts Concerning the Case of the Great Beef Contract” | 1W | * |
| GC | “The German Chicago” | 1W | * |
| HCC | “How to Cure a Cold” / “Curing a Cold” | 1W | |
| HF | Adventures of Huckleberry Finn | 1W | |
| HWBF | “Rev. Henry Ward Beecher's Farm” | 1W | * |
| IA | The Innocents Abroad | 1W | |
| JA | Personal Recollections of Joan of Arc | 1W | |
| JF | jumping frog story | 1W | |
| JT | “Journalism in Tennessee” | 1W | |
| KLS | King Leopold's Soliloquy | 1W | |
| L | “Luck” | 1W | * |
| LM | Life on the Mississippi | 1W | * |
| MCH | “The Man that Corrupted Hadleyburg” | 1W | |
| MCW2 | “Mrs. McWilliams and the Lightning” | 1W | * |
| MF | “Making a Fortune” | 1W | * |
| MPBN | “The £1,000,000 Bank-Note” | 1W | * |
| NNB | “Notice to the Next Burglars” | 1W | |
| PBP | “Punch, Brothers, Punch” / “A Literary Nightmare” | 1W | |
| PP | The Prince and the Pauper | 1W | |
| PSD | “To the Person Sitting in Darkness” | 1W | |
| PW | The Tragedy of Pudd'nhead Wilson | 1W | |
| RG | “Running for Governor” | 1W | * |
| RI | Roughing It | 1W | |
| SCL | “Switzerland, the Cradle of Liberty” (in the North American Review) | 1W | * |
| SK | Sketches, New and Old | 1W | |
| STC | “A Salutation-Speech from the Nineteenth Century to the Twentieth” | 1W | * |
| SVL | “Science vs. Luck” | 1W | * |
| TA | A Tramp Abroad | 1W | * |
| TAL | “The Awful German Language” (Appendix D to A Tramp Abroad) | 1W | * |
| TCT | “The Canvasser's Tale” | 1W | * |
| TLT | “Two Little Tales” | 1W | * |
| TS | The Adventures of Tom Sawyer | 1W | |
| WIM | What is Man? | 1W | |
| L:CH | requesting a hymn book (letter to Andrew Carnegie) | 2L | |
| L:G | on Gutenberg (letter to Adolf Goerz) | 2L | * |
| L:NC | on the future national capital (letter to the New York Sun) | 2L | |
| L:P | on receiving a pension (letter to John C. Black) | 2L | * |
| L:PS | on the postal service (letter to the New York Evening Post) | 2L | * |
| L:RC | letter to Ruth Cleveland | 2L | |
| L:SI | on the sandwich islands (letter to the New York Tribune) | 2L | * |
| L:T | letter to the Secretary of the Treasury | 2L | * |
| L:WF | letter to President Francis of the St. Louis World Fair | 2L | |
| S:B | “The Babies” (13 Nov. 1879) | 3S | * |
| S:CS | on the civil services / supporting Rutherford B. Hayes (30 Sept. 1876) | 3S | * |
| S:CT | honoring Charlemagne Tower (28 Feb. 1899) | 3S | |
| S:EH | speech at Englisches Haus, Berlin (26 Nov. 1891) | 3S | |
| S:GG | on General Grant's grammar (27 April 1887) | 3S | * |
| S:GH | “Introducing General Hawley” (16 Oct. 1879) | 3S | * |
| S:GL | speech at YMCH hall, Berlin (13 Jan. 1892) | 3S | |
| S:GOR | material from “His Grandfather's Old Ram” (multiple occasions) | 3S | |
| S:NGW | “A New German Word” (10 March 1899) | 3S | |
| S:PC | announcing presidential candidacy (2 May 1900) | 3S | * |
| S:RI | material from Roughing It (multiple occasions) | 3S | |
| S:SDS | “Die Schrecken der Deutschen Sprache” (31 Oct. 1897) | 3S | |
| S:SC | Savage Club Supper Speech (15 Nov. 1895) | 3S | * |
| S:TI | on behalf of Tuskegee Institute, New York City (22 Jan. 1906) | 3S | |
| S:W | “Woman – God Bless Her” (22 Dec. 1882) | 3S | * |