| A Classification of the Spectra of the Stars (1925) by Annie Jump Cannon |
| A Revision of Leander McCormick Observatory Catalogue of Proper Motions (1915) by Annie Jump Cannon |
| Cosmic Connection: An Extraterrestrial Perspective (1973) by Carl Sagan |
| Cosmos (1980) by Carl Sagan |
| Draper Catalogue of Stellar Spectra (1924) by Annie Jump Cannon |
| Measuring the Universe: And the Quest for Dark Energy (2011) by Saul Perlmutter |
| Pale Blue Dot: A Vision of the Human Future in Space (1994) by Carl Sagan |
| Spectral Miscellanea (1927) by Annie Jump Cannon |
| Theoria motuum planetarum et cometarum (1744) by Leonhard Euler |
