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- Oregon 75
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- Remote-sensing images 7
- Agriculture 6
- Idaho 5
- Maps 5
- Washington (State) 5
- Legislators 4
- Pioneers 4
- Agricultural industries 3
- Exhibitions 3
- Gold coins 3
- Topographic maps 3
- Cities and towns 2
- Columbia Basin Agricultural Research Center 2
- Correspondence 2
- Europe 2
- Fishing 2
- Frontier and pioneer life 2
- Hunting 2
