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Stream measurements --- Hydrology --- Water-supply --- Stream measurements. --- Hydrology. --- Delaware River Watershed (N.Y.-Del. and N.J.) --- United States
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Stream measurements --- Hydrology --- Water-supply --- Delaware River Watershed (N.Y.-Del. and N.J.) --- United States
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Water quality --- Water-supply --- Water quality. --- Water-supply. --- Ohio River Watershed.
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Water quality --- Water-supply --- Water quality. --- Water-supply. --- Northeastern States.
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