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Subjects
- Engineering.[remove]2
- Engineers -- Michigan.[remove]2
- Agriculture -- Michigan -- Washtenaw County.1
- Construction industry -- Michigan -- Ecorse.1
- Dwellings -- Michigan -- Ann Arbor.1
- Industrial buildings.1
- Industries -- Michigan -- Ecorse.1
- Interiors -- Steel mills.1
- Interiors.1
- Laboratories.1
- Laborers.1
- Machinery.1
- Offices.1
- Petroleum industry and trade -- United States.1
- Petroleum industry.1
- Photography.1
- Railroad cars.1
- Railroads -- Michigan.1
- Rubber industry and trade -- United States.1
- Rubber industry.1