Science - 2000 - 333 pages
Explains that conditions on Earth and other planets facilitate simple lifeforms, and that complex plant and animal life maybe more rare than historically predicted.
Tom Head - Biography & Autobiography - 2006 - 167 pages
A collection of interviews and profiles show how Sagan, a lifelong skeptic, refined his views and expressed amazement that Earth encompasses everything about which he cared.
John S. Lewis - Science - 1998 - 236 pages
Discusses the search for new planets, examines evidence of planets orbiting distant suns, and speculates on the possibility of life on distant planets
Jacques Monod - Science - 1971 - 198 pages
"A philosophical statement whose explicit intention is to sweep away as both false and dangerous the 'animist' conception of man that has dominated virtually all Western world ...