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Observation balloon
Air & Space Power Journal
American Aviation Heritage
The Legend of T
History of Flight: a Timeline
James Carruthers Memorial Aviation Collection of the Institute of Aeronautical History H1950.2
British Military Ballooning History (From the British Balloon Museum and Library)
Doctorate of Philosophy
Royal Air Force Historical Society Journal 54
The U.S. Air Service in World War I, Vol 1
Krainik Ballooning Collection, 1859-1934
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