M
- Machinery industry. (6)
- Machinery. (9)
- Mantels. (2)
- Maps. (1)
- Markets. (15)
- Medical education. (25)
- Medical equipment & supplies. (15)
- Medical offices. (16)
- Mental institutions. (8)
- Merchandise displays. (45)
- Metallurgical industry. (36)
- Methodist churches. (23)
- Military education. (36)
- Military facilities. (26)
- Military training. (56)
- Millinaries. (17)
- Mills. (3)
- Mining. (2)
- Mobile homes. (6)
- Model houses. (90)
- Model railroads. (7)
- Model ships. (59)
- Models. (352)
- Montages. (6)
- Monuments & memorials. (91)
- Motels. (10)
- Motion picture theaters. (92)
- Moving & storage trade. (5)
- Murals. (24)
- Mushrooms. (1)
- Music education. (128)
- Music halls. (14)
- Music stores. (14)