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Ltd., 1996, LCCN 96-67282, ISBN 978-0-7643-0063-9, pages 65. http://home.att.net/~jbaugher/1950.html Habermehl, Mike, "Fatigue", Airpower, Granada Hills

Congress Card Number 81-80194, ISBN 0-688-00621-3, pages 198–199. http://home.att.net/~jbaugher/1940.html Archived 13 July 2009 at the Wayback Machine. Bowers