Proceedings of 1981 Soaring Society of America National Convention : Phoenix, Arizona, January 14-18, 1981
Proceedings of 1981 Soaring Society of America National Convention ; 1981 ; Phoenix, Ariz. Proceedings of 1981 Soaring Society of America National Convention (Phoenix, Ariz.) : 1981.01.14-18
1981
116 S
graph. Darst
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