- United States Declaration of Independence (HTML) (English) by United States
- The United States in the Light of Prophecy (English) by Smith, Uriah
- The United States of America, Part 1 (English) by Sparks, Edwin Erle
- United States Presidents' Inaugural Speeches (English) by United States. Presidents.
- The United States Since the Civil War (English) by Lingley, Charles Ramsdell
- The Unity of Civilization (English) by Various
- Unity of Good (English) by Eddy, Mary Baker
- The Universal Copyright Convention (1988) (English) by Coalition for Networked Information
- The Universe — or Nothing (English) by Moldeven, Meyer
- The University of Hard Knocks (English) by Parlette, Ralph
- The Unknown Eros (English) by Patmore, Coventry Kersey Dighton
- The Unknown Guest (English) by Maeterlinck, Maurice
- The Unknown Guest (English) by Teixeira de Mattos, Alexander
- Unknown Mexico, Volume 1 (of 2) - A Record of Five Years' Exploration Among the Tribes of the Western Sierra Madre; In the Tierra Caliente of Tepic and Jalisco; and Among the Tarascos of Michoacan (English) by Lumholtz, Carl
- The Unknown - Night Watches, Part 7. (English) by Jacobs, W. W.
- Unknown to History: a story of the captivity of Mary of Scotland (English) by Yonge, Charlotte Mary
- Unleavened Bread (English) by Grant, Robert
- Unmanned (English) by Oliver, Stephen
- Un mois en Afrique (French) by Bonaparte, Pierre-Napoléon
- An Unpardonable Liar (English) by Parker, Gilbert
- Un paseo por Paris, retratos al natural (Spanish) by Barcia, Roque
- The Unpopular Review, Volume II Number 3 (English) by Various
- An Unprotected Female (English) by Trollope, Anthony
- The Unseen Bridgegroom - or, Wedded For a Week (English) by Fleming, May Agnes
- The Unseen World and Other Essays (English) by Fiske, John
- An Unsocial Socialist (English) by Shaw, George Bernard
- The Unspeakable Gentleman (English) by Marquand, John P.
- The Unspeakable Perk (English) by Adams, Samuel Hopkins
- Unspoken Sermons - Series I., II., and II. (English) by MacDonald, George
- The Untamed (English) by Brand, Max
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