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- Industrial facilities--Oregon--Portland, 6 results
- Power-plants--Oregon--Portland, 6 results
- cellulose nitrate film, 3 results
- glass plate negatives, 3 results
- Electric generators, 2 results
- Electric machinery, 2 results
- Machinery, 2 results
- Boilers, 1 results
- Brickwork, 1 results
- Furnaces, 1 results