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http://www.phy6.org/Stargaze/Lnewton3.htm

http://www-spof.gsfc.nasa.gov/stargaze/Snewton3.htm

http://quest.nasa.gov/aero/planetary/atmospheric/propulsion.html

http://www.grc.nasa.gov/WWW/K-12/airplane/newton3.html
Other

http://theory.uwinnipeg.ca/mod_tech/node24.html