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British Aerospace HOTOL - Wikipedia
Skylon (spacecraft) - Wikipedia
SABRE (rocket engine) - Wikipedia
HOTOL - Encyclopedia Astronautica
Skylon: Alan Bond's mission to replace space rockets with ... - WIRED
Spaceplanes: The return of the reusable spacecraft? - BBC
An-325: The Giant Carrier for Britain's Interim HOTOL Spaceplane
Aerospaceweb.org | Ask Us - HOTOL and Skylon
BBC - h2g2 - HOTOL - The British Space Plane
Skylon Space Plane: The Spacecraft of Tomorrow
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