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Dalles (Or.) --- Oregon
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Dalles (Or.) --- Oregon
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Landforms --- Terraces (Geology) --- North America --- Oregon.
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Hydrologic models --- Runoff --- Coasts --- Mathematical models. --- Oregon.
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Rain and rainfall --- Streamflow --- Mathematical models. --- Oregon.
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Hydrogeology --- Hydrogeology --- Geology --- Geology --- Oregon. --- Washington (State)
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Water quality --- Trace elements in water --- Environmental aspects --- Amazon Creek (Or.) --- Oregon --- Oregon
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Groundwater --- Water-supply --- Umatilla Indian Reservation (Or.) --- Oregon
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Indians of North America --- Excavations (Archaeology) --- Antiquities. --- Oregon
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Catostomidae --- Eutrophication --- Lake ecology --- Agricultural industries --- Conservation --- Environmental aspects --- Oregon
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