http://www.grc.nasa.gov/WWW/k-12/TRC/Rockets/history_of_rockets.html
Editor: Tom Benson
Last Updated: Fed 12 2010
NASA
http://en.wikipedia.org/wiki/History_of_rocketry
Last Updated: 8 December 2010
Wikipedia
http://www.solarviews.com/eng/rocket.htm
Editor: Calvin J. Hamilton
Last Updated: 1997-2001
SolarViews
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