- Uncle Vanya: Scenes from Country Life in Four ActsAuthor: Anton Pavlovich ChekhovLanguage: English
- Uncle Wiggily and Old Mother Hubbard: Adventures of the Rabbit Gentleman with the Mother Goose CharactersAuthor: Howard Roger Garis, Bloomfield, Edward [Illustrator], Lang CampbellLanguage: English
- Uncle Wiggily in the WoodsAuthor: Howard Roger Garis, Louis WisaLanguage: English
- Uncle Wiggily's AdventuresAuthor: Howard Roger Garis, Louis WisaLanguage: English
- Uncle Wiggily's TravelsAuthor: Howard Roger Garis, Louis WisaLanguage: English
- Uncle William: The Man Who Was Shif'lessAuthor: Jennette LeeLanguage: English
- Unconscious ComediansAuthor: Honoré de Balzac, Katharine Prescott WormeleyLanguage: English
- Unconscious MemoryAuthor: Samuel ButlerLanguage: English
- Und die ihr alle meine Brüder seidAuthor: Ida FrohnmeyerLanguage: German
- Under Drake's Flag: A Tale of the Spanish MainAuthor: G. A. (George Alfred) Henty, Gordon BrowneLanguage: English
- Under FireAuthor: Charles KingLanguage: English
- Under Fire: The Story of a SquadAuthor: Henri Barbusse, W. Fitzwater WrayLanguage: English
- Under Handicap: A NovelAuthor: Jackson GregoryLanguage: English
- Under King ConstantineAuthor: Katrina TraskLanguage: English
- Under Sealed OrdersAuthor: H. A. (Hiram Alfred) CodyLanguage: English
- Under the AndesAuthor: Rex StoutLanguage: English
- Under the Chilian Flag: A Tale of War between Chili and PeruAuthor: Harry Collingwood, W. (William) RaineyLanguage: English
- Under the Country SkyAuthor: Grace S. (Grace Smith) Richmond, Rogers, Frances [Illustrator]Language: English
- Under the DeodarsAuthor: Rudyard KiplingLanguage: English
- Under the dragon flagAuthor: Allan, JamesLanguage: English
- Under the Great BearAuthor: Kirk Munroe, Howard GilesLanguage: English
- Under the Greenwood Tree; Or, The Mellstock Quire: A Rural Painting of the Dutch SchoolAuthor: Thomas HardyLanguage: English
- Under the LilacsAuthor: Louisa May AlcottLanguage: English
- Under the Meteor Flag: Log of a Midshipman during the French Revolutionary WarAuthor: Harry CollingwoodLanguage: English
- Under the Ocean to the South Pole; Or, the Strange Cruise of the Submarine WonderAuthor: Rockwood, RoyLanguage: English
- Under the Prophet in Utah; the National Menace of a Political PriestcraftAuthor: Frank J. Cannon, Harvey Jerrold O'HigginsLanguage: English
- Under the Rebel's ReignAuthor: Charles Neufeld, Charles Mills SheldonLanguage: English
- Under the red robeAuthor: Stanley John WeymanLanguage: English
- Under the RedwoodsAuthor: Bret HarteLanguage: English
- Under the RoseAuthor: Frederic Stewart IshamLanguage: English
- Under the SkylightsAuthor: Henry Blake FullerLanguage: English
- Under the StormAuthor: Charlotte M. (Charlotte Mary) YongeLanguage: English
- Under the TreeAuthor: Elizabeth Madox RobertsLanguage: English
- Under the Trees and ElsewhereAuthor: Hamilton Wright MabieLanguage: English
- Under the Waves: Diving in Deep WatersAuthor: R. M. (Robert Michael) Ballantyne, Pearson [Illustrator]Language: English
- Under the Window: Pictures & Rhymes for ChildrenAuthor: Kate GreenawayLanguage: English
- Under Two FlagsAuthor: OuidaLanguage: English
- Under Wellington's Command: A Tale of the Peninsular WarAuthor: G. A. (George Alfred) Henty, Walter PagetLanguage: English
- Under Western EyesAuthor: Joseph ConradLanguage: English
- Underground: Hacking, madness and obsession on the electronic frontierAuthor: Dreyfus, Suelette, Julian AssangeLanguage: English
- Understanding the ScripturesAuthor: Francis John McConnellLanguage: English
- Understood BetsyAuthor: Dorothy Canfield FisherLanguage: English
- UndertowAuthor: Kathleen Thompson NorrisLanguage: English
- UnderwoodsAuthor: Robert Louis StevensonLanguage: English
- UndineAuthor: La Motte-Fouqué, Friedrich Heinrich Karl, Freiherr de, Charlotte M. (Charlotte Mary) YongeLanguage: English
- UndineAuthor: La Motte-Fouqué, Friedrich Heinrich Karl, Freiherr de, Bunnett, F. E. (Fanny Elizabeth)Language: English
- UndineAuthor: La Motte-Fouqué, Friedrich Heinrich Karl, Freiherr de, Macgregor, Mary [Adapter], Katharine CameronLanguage: English
- Une Confédération Orientale comme solution de la Question d'Orient (1905)Author: AnonymousLanguage: French
- Une femme d'argentAuthor: Hector MalotLanguage: French
- Une fête de Noël sous Jacques CartierAuthor: Ernest MyrandLanguage: French
- Une histoire d'Amour : George Sand et A. de Musset: Documents inédits, Lettres de MussetAuthor: Paul MariétonLanguage: French
- Une Intrigante sous le règne de FrontenacAuthor: J. B. (Jean Baptiste) CaouetteLanguage: French
- Une page d'amourAuthor: Émile ZolaLanguage: French
- Une politique européenne : la France, la Russie, l'Allemagne et la guerre au TransvaalAuthor: Etienne GrosclaudeLanguage: French
- Une Pupille GenanteAuthor: Roger DombreLanguage: French
- Une vieAuthor: Guy de MaupassantLanguage: French
- Une Vie, a Piece of String and Other StoriesAuthor: Guy de MaupassantLanguage: English
- Une ville flottanteAuthor: Jules VerneLanguage: French
- Uneasy MoneyAuthor: P. G. (Pelham Grenville) WodehouseLanguage: English
- Unelmiensa uhri: RomaaniAuthor: Marja SalmelaLanguage: Finnish