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- Milling machinery 27
- Photography, Industrial 27
- Mills and mill-work 25
- Industrial equipment 15
- Steel industry and trade 13
- Agricultural machinery 10
- Photography, Agricultural 10
- Feed mills 8
- Grain elevators 8
- Steel --Heat treatment 6
- Iron and steel workers 3
- Open-hearth furnaces 3
- Rolling (Metal-work) 3
- Abandoned buildings 2
- Abandonment of property 2
- Photography of interiors 2
- Photography, Close-up 2
- Taconite 2
- Taconite industry 2
- Basic oxygen furnaces 1