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Stream self-purification --- Water quality --- Water --- Mathematical models. --- Dissolved oxygen --- Mathematical models. --- Oregon
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Stream self-purification --- Water quality --- Water --- Stream self-purification --- Water --- Water quality. --- Mathematical models. --- Dissolved oxygen --- Mathematical models. --- Mathematical models. --- Dissolved oxygen --- Mathematical models. --- Oregon
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DDT (Insecticide) --- DDT (Insecticide) --- Environmental aspects --- Toxicology --- Age factors --- Washington (State)
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Water quality --- Willamette River Watershed (Or.) --- Oregon
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