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        Subject
        Earth dams [2]
        Fishes--Effect of dams on--Columbia River Watershed [1]
        Fishes--Migration--Columbia River Watershed [1]
        Flood dams and reservoirs--Oregon [2]
        Frictional resistance (Hydrodynamics) [1]
        Hydraulic models--Testing [2]
        Hydroelectric power plants--Environmental aspects--Columbia River [1]
        Hydroelectric power plants--Environmental aspects--Columbia River Watershed [1]
        Hydroelectric power plants--Environmental aspects--Snake River (Wyo.-Wash.) [1]
        Pacific salmon--Effect of dams on--Columbia River [1]
        Pacific salmon--Migration--Columbia River [2]
        Pacific salmon--Migration--Snake River (Wyo.-Wash.) [1]
        Pipe--Hydrodynamics [1]
        Turbines--Environmental aspects [1]
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