| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler | Brewster, David, Sir, 1781-1868 | en | | | | Brahe, Tycho, 1546-1601; Kepler, Johannes, 1571-1630; Scientists -- Biography; Galilei, Galileo, 1564-1642 | 2008-07-07 |
| Kepler | Bryant, Walter W. (Walter William) | en | | | | | 2004-05-01 |
| Aether and Gravitation | Hooper, William George | en | | Philosophy of gravitation -- Matter -- Aether -- Energy -- Heat, a mode of motion -- Light, a mode of motion -- Aether and electricity -- Aether and magnetism -- Aether and Newton's laws of motion -- Aether and Kepler's laws -- Aether and comets -- Aether and starry world -- Aether and the universe. | | Ether (Space); Gravitation; Force and energy; Matter | 2008-02-22 |