References
^ Weick, Fred E. and Hansen, James R. (1988). 9780874749502, Smithsonian Institution Press. ISBN 9780874749502 (revised Dec 2014)^ James R. Hansen, Fred E. WeickFrom the Ground Up : The Autobiography of an Aeronautical Engineer by Fred E. Weick and James R. Hansen (1988, Hardcover) ISBN 9780874749502 (revised Mar 2015)
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