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- Rivers 52
- Northwest, Pacific 24
- outdoor photographs 20
- Bodies of water 16
- Mountains 13
- Trees 11
- West (U.S.) 11
- Canals--Design and construction--Costs 10
- Dams--Design and construction 10
- Transportation 10
- Water resources development 10
- Indians of North America 9
- Photography 9
- Tipis 9
- Cottonwood trees 8
- Indian encampments 8
- Umatilla Indian Reservation (Or.) 8
- Conifers 6
- Horses 6
- Landscapes 6