Western Waters Digital Library
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- Locks (Hydraulic engineering) 25
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- United States--Appropriations and expenditures 11
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- River surveys 7
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 18
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- Columbia River >> Douglas County >> Washington >> United States 4
- The Dalles >> Wasco County >> Oregon >> United States 4
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Type
- Text 16
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