Subjects
- Metallurgical industry.1
- Metalwork.1
- Military camps--1940-1950.1
- Military facilities--1940-1950.1
- Military facilities--China--1910-19301
- Military facilities--France--1940-1950.1
- Military facilities--Marshall Islands--1940-1950.1
- Mineral industries.1
- Mines.1
- Mining industry--Colorado--1900-1910.1
- Mining machinery.1
- Mining--Michigan.1
- Mining.1
- Minstrel music.1
- Minstrel shows--Vermont--1920-1930.1
- Money--1870-1890.1
- Money.1
- Monuments & memorials--1940-1950.1
- Monuments & memorials.1
- Mountain railroads.1