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Willamette River, Oregon, United States, (Hydrographic)
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Current results range from 1951 to 2002
- Fishes -- Oregon -- Willamette River -- Effect of water pollution on1
- Freshwater fishes -- Effect of water pollution on1
- Land use -- Environmental aspects -- Oregon -- Willamette River Watershed1
- Landscape changes -- Oregon -- Willamette River Watershed1
- Vegetation mapping -- Oregon -- Willamette River Watershed1
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