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- Industrial equipment 21
- Photography, Industrial 21
- Steel industry and trade 21
- Mills and mill-work 12
- Milling machinery 9
- Iron and steel workers 7
- Steel --Heat treatment 7
- Blast furnaces 3
- Open-hearth furnaces 3
- Basic oxygen furnaces 2
- Photography of water 2
- Photography, Close-up 2
- Rolling (Metal-work) 2
- Steel --Metallurgy --Oxygen processes 2
- Architectural photography 1
- Architecture 1
- Chains 1
- Coke-ovens 1
- Docks and ports 1
- Girders 1