Gerard K. O'Neill The High Frontier: Human Colonies in Space. William Morrow & Co., N.Y 1976.
Links - The links below provide additional information from other organizations. Earth Colony 1 is not affiliatied with these organizations.
Space Colonization (wikipedia) - http://en.wikipedia.org/wiki/Space_colonization
NASA Space Colonization Library - http://www.hq.nasa.gov/office/hqlibrary/pathfinders/colony.htm
National Aeronautics and Space Administration (NASA) - http://www.nasa.gov/home/index.html?skipIntro=1
National Space Society (NSS) - http://www.nss.org/
Space-Frontier Foundation - People dedicated to opening the space frontier to human settlement - http://www.space-frontier.org/
American Institute of Aeronautics and Astronautics - http://www.aiaa.org/
X Prize Cup - http://www.xpcup.com/index.cfm
The Artemis Project - http://www.asi.org/adb/index.html
Mars Society - http://www.marssociety.org/
Lunar Explorers Society International - http://www.lunarexplorers.nl/startframes.html
Links to a variety of sites on space colonization - http://www.aleph.se/Trans/Tech/Space/
