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Index to U.S. Geological Survey computer files containing daily values for water parameters to September 30, 1971
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Index to U.S. Geological Survey computer files containing daily values for water parameters to September 30, 1971, northeastern region
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Index to water-quality data available from the U.S. Geological Survey in machine-readable form to December 31, 1972, southeastern region
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Index to water-quality data available from the U.S. Geological Survey in machine-readable form to December 31, 1972, western region
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