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Subjects
- Quarrying.[remove]2
- Aeronautics.1
- Airports -- Michigan.1
- Boat and ship industry.1
- Bridges -- Michigan.1
- Bridges.1
- Business records.1
- Camping.1
- Cement.1
- Construction industry.1
- Defense industry.1
- Engineers -- Michigan.1
- Farms.1
- Ferries.1
- Forests and forestry -- Michigan -- Maps.1
- Fraternities and sororities.1
- German Americans -- Michigan.1
- Interiors -- Fraternities and sororities.1
- Iron industry.1
- Iron mining.1