Angelus Studio photographs, 1880s-1940s
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- Power-plants 61
- Northwestern Electric Company 60
- Industrial buildings 59
- Factories 58
- Industrial equipment 45
- Hydroelectric power plant retirement 12
- Hydroelectric power plants 12
- Hydroelectric generators 3
- Turbine pumps 3
- Pittock Station (Portland, Oregon) 2
- indoor portraits 2
- Conveyor belts 1
- Forest products industry 1
- Furnaces 1
- Plywood industry 1
- Railroad tracks 1
- Roads 1
- Venturi tubes 1