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Survivors from Earth	Project Orion: The True Story of the Atomic Spaceship
The Great Frontier	The High Frontier: Human Colonies in Space
Entering Space: Creating a Spacefaring Civilization	The Frontier in American History
The Age of Triage: Fear and Hope in an Overcrowded World	The Population Explosion
Population Biology: Concepts and Models	Outerland
The Human Experiment: Two Years and Twenty Minutes Inside Biosphere 2	Kraft Ehricke's Extraterrestrial Imperative
The Case for Mars	Brave New World