| Author's List |
| 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 | ||||
| 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 |