- Chemical Propulsion Information Agency - Technical resources: missile, space, gun propulsion data: bulletins, publications, database of propulsion papers, news, meeting announcements, event calendar, technology reviews, acronym and trade name list.
www.cpia.jhu.edu
- Experimental Rocket Propulsion Society - liquid engine development
www.erps.org
- Propulsion Polymers - Hobbyist scale hybrid rocket motors
propulsionpolymers.com
- Thiokol Propulsion Home Page - Makes solid propulsion motors for space, defense, tactical.
www.thiokol.com
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