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Subjects
- Agricultural machinery.1
- Conservation of natural resources -- Michigan.1
- Dams.1
- Ecology -- Study and teaching.1
- Ferries.1
- Fire fighters -- Michigan.1
- Forest fires -- Michigan.1
- Forestry.1
- Freedom Train.1
- Guards.1
- Harbors.1
- Horse railroads.1
- Hotels and taverns.1
- Hunting.1
- Iron industry.1
- Lifeboats.1
- Lifesaving stations.1
- Logging railroads.1
- Lumber industry.2
- Marine accidents.1