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- Architectural photography 4
- Architecture 4
- Basic oxygen furnaces 2
- Blast furnaces 4
- Buildings 2
- Chains 1
- Coke-ovens 1
- Docks and ports 1
- Factories 3
- Girders 1
- Gunite 1
- Industrial equipment 21
- Industrial power trucks 1
- Iron and steel workers 8
- Metals --Finishing 1
- Milling machinery 11
- Mills and mill-work 21
- Mines and mineral resources 2
- Open-hearth furnaces 4
- Photography of interiors 1