| title | creator | language | description | tableOfContents | contributor | subject | created |
| Fantasia of the Unconscious | Lawrence, D. H. (David Herbert), 1885-1930 | en | | | | | 2007-02-24 |
| Indian Nullification of the Unconstitutional Laws of Massachusetts Relative to the Marshpee Tribe
Or, the Pretended Riot Explained | Apess, William, 1798-1839 | en | | | | Mashpee Indians -- Legal status, laws, etc.; Mashpee Indians -- Land tenure; Indians of North America -- Legal status, laws, etc. | 2004-06-01 |
| Unconscious Comedians | Balzac, Honoré de, 1799-1850 | en | | | Wormeley, Katharine Prescott, 1830-1908 [Translator] | | 1998-03-01 |
| The Unconstitutionality of Slavery | Spooner, Lysander, 1808-1887 | en | | | | | 2010-03-31 |