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- Contests (3)
- Contests--Michigan--Wayne County--1930-1940. (3)
- Model airplanes (3)
- Model airplanes--1930-1940. (3)
- Aeronautics (2)
- Aeronautics--Michigan--Detroit--1930-1940 (2)
- Autogiros (2)
- Autogiros--Michigan--Detroit--1930-1940. (2)
- Buhl Autogiro (2)
- Buhl Autogiro--Michigan--Detroit--1930-1940 (2)
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Coverage: 1930-1940.