| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Most Ancient Lives of Saint Patrick
Including the Life by Jocelin, Hitherto Unpublished in America, and His Extant Writings | Various | en | | | O'Leary, James [Editor] | | 2006-06-01 |
| George Borrow and His Circle
Wherein May Be Found Many Hitherto Unpublished Letters Of
Borrow And His Friends | Shorter, Clement King, 1857-1926 | en | | | | | 2006-11-12 |
| The North American Slime-Moulds
A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species | MacBride, Thomas H. (Thomas Huston) | en | | | | | 2010-01-27 |
| The Covenanters of Damascus; A Hitherto Unknown Jewish Sect | Moore, George Foot | en | | | | | 2010-04-12 |
| Some Remains (hitherto unpublished) of Joseph Butler, LL.D. | Butler, Joseph, 1692-1752 | en | | | Steere, Edward [Editor] | | 2007-03-12 |