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Topic
- Bodies of water 14
- Oregon--History 5
- Docks 4
- Harbors 4
- Rivers 4
- Ships 4
- Aerial photography 3
- Buildings 3
- Cities and towns 3
- Electric power production 3
- Electric power-plants 3
- Port of Portland (Or.) 3
- Roads 3
- Shipbuilding industry 3
- Shipbuilding industry--Employees 3
- Shipbuilding 3
- Shipbuilding--Equipment and supplies 3
- Flags--United States 2
- Lumber 2
- Masts and rigging 2