Lighter-than-air' aircraft has first test flight | CNN
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Lighter Than Air: An Illustrated History of Balloons and Airships: Crouch, Tom D.: 9780801891274: Amazon.com: Books
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Ships That Were Lighter Than Air | Naval History Magazine - June 2011 Volume 25, Number 3
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Lighter Than Air: An Illustrated History of the Development of Hot-Air Balloons and Airships: Owen, David: 9780785810452: Amazon.com: Books
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