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Model rocket motor classification - Wikipedia
Model Rocket Engines - Hobbylinc
Model Rockets & How-To Rocketry Information
Engines - Estes Rockets
Estes Rockets
JonRocket.com, Model Rocket Kits, Parts, Supplies, and Accessories
Model Solid Rocket Engine | Glenn Research Center | NASA
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Aerotech Composite Model Rocket Engines - asp-rocketry.com