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- Architecture, American 351
- Architecture--United States 340
- Hops 82
- Agriculture 42
- Roads 19
- Architecture 11
- Northwest, Pacific 11
- Bodies of water 6
- Public utilities 6
- Aerial photographs 5
- Barley 5
- Dams 5
- Forests and forestry 5
- Rivers 5
- Water-power 5
- Agricultural implements 4
- Beer 4
- Birds--Nests 4
- Covered bridges 4
- Dedications 4
