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- Bridges (28)
- Bridge construction (10)
- Bridge construction--Michigan--1930-1940 (10)
- Bridges--Michigan--1930-1940 (10)
- Mackinac Bridge (Michigan) (10)
- Mackinac Bridge (Michigan)--1930-1940 (10)
- Bridges--Michigan--Trenton--1930-1940 (9)
- Work Projects Administration (U.S.) (9)
- Work Projects Administration (U.S.)--1930-1940 (9)
- Dedications (7)
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