Subjects
- Logging railroads.1
- Logging--Michigan.1
- Lumber camps--Michigan.1
- Lumbering.1
- Lumbermen.1
- Machine shops.1
- Machinery.1
- Manufacturing.1
- Masonry.1
- Metallurgical industry.1
- Metalwork.1
- Mineral industries.1
- Mines.1
- Mining machinery.1
- Mining--Michigan.1
- Mining--United States.1
- Mining.1
- Money.1
- Mountain railroads.1
- Naval yards & naval stations.1