| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Perpetuation of Living Beings; hereditary transmission and variation | Huxley, Thomas Henry, 1825-1895 | en | | | | | 2001-11-01 |
| The Seventh Day Sabbath, a Perpetual Sign
1847 edition | Bates, Joseph, 1792-1872 | en | | | | Sabbath; Seventh-Day Adventists -- Doctrines | 2008-11-15 |
| Conditions of Existence as Affecting the Perpetuation of Living Beings | Huxley, Thomas Henry, 1825-1895 | en | | | | | 2001-11-01 |
| An Inquiry Into The Nature Of Peace And The Terms Of Its Perpetuation | Veblen, Thorstein, 1857-1929 | en | | | | | 2007-02-27 |
| On the Origin of Clockwork, Perpetual Motion Devices, and the Compass | Price, Derek J. de Solla (Derek John de Solla), 1922-1983 | en | | | | Clocks and watches; Horology | 2009-09-16 |
| The Seventh Day Sabbath, a Perpetual Sign, from the Beginning to the Entering into the Gates of the Holy City, According to the Commandment | Bates, Joseph, 1792-1872 | en | | | | Sabbath; Seventh-Day Adventists -- Doctrines | 2007-07-18 |
| The Perpetual Curate | Oliphant, Mrs. (Margaret), 1828-1897 | en | Part of the Chronicles of Carlingford. | | | Clergy -- Fiction; England -- Social life and customs -- 19th century -- Fiction | 2009-02-05 |