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- Rivers--Oregon 18
- Riparian areas--Management 7
- Agriculture 3
- Barns 3
- Boats 3
- Farms 3
- Lakes--Oregon 3
- Dams 2
- Dwellings 2
- Mules 2
- Stumpwood 2
- Wheat 2
- Alsike clover 1
- Bridges 1
- Carriages and carts 1
- Channels 1
- Coasts--Oregon 1
- Combines (Agricultural machinery) 1
- Drilling and boring machinery 1
- Feed-water pumps 1