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- Mills and mill-work 33
- Photography, Industrial 33
- Steel industry and trade 33
- Industrial equipment 15
- Milling machinery 13
- Steel --Heat treatment 6
- Iron and steel workers 5
- Rolling (Metal-work) 5
- Railroads 4
- Blast furnaces 3
- Factories 3
- Open-hearth furnaces 3
- Railroad rails 3
- Architectural photography 2
- Architecture 2
- Photography of railroads 2
- Photography, Close-up 2
- Railroad cars 2
- Sheet-metal, Corrugated 2
- Basic oxygen furnaces 1