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- Mills and mill-work 21
- Photography, Industrial 21
- Steel industry and trade 21
- Industrial equipment 12
- Milling machinery 11
- Iron and steel workers 5
- Steel --Heat treatment 5
- Blast furnaces 3
- Open-hearth furnaces 3
- Railroads 3
- Rolling (Metal-work) 3
- Architectural photography 2
- Architecture 2
- Factories 2
- Railroad cars 2
- Railroad rails 2
- Sheet-metal, Corrugated 2
- Basic oxygen furnaces 1
- Buildings 1
- Chains 1