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Topic
- Reservoirs 52
- Dams 10
- Salt River Indian Reservation (Ariz.) 6
- Hydraulic structures 5
- Earth dams 3
- Recreation areas--Public use 3
- Spectators 3
- Watchtowers 3
- Aerial views 2
- Construction 2
- Dwellings 2
- Forests and forestry 2
- Landscapes 2
- Mountains--Oregon 2
- Municipal water supply 2
- Oregon State University. Extension Service 2
- Parks 2
- Recreation areas 2
- Rivers--Oregon 2
- Trees 2