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2. Quality of surface waters of the United States, 1966. Parts 1 and 2, North Atlantic slope basins and south Atlantic slope and eastern Gulf of Mexico basins
3. Quality of surface waters of the United States, 1966. Parts 7 and 8, Lower Mississippi River basin and western Gulf of Mexico basins
4. Quality of surface waters of the United States, 1966. Parts 5 and 6, Hudson Bay and Upper Mississippi River Basins, and Missouri River Basin
5. Quality of surface waters of the United States, 1966. Parts 12-16, North Pacific Slope Basins, Alaska, and Hawaii and other Pacific areas
6. Quality of surface waters of the United States, 1966. Parts 9-11, Colorado River Basin to Pacific Slope Basins in California
7. Quality of surface waters of the United States, 1966. Parts 3 and 4, Ohio River Basin and St. Lawrence River Basin
8. Quality of surface waters of the United States, 1967. Parts 12-16, North Pacific Slope Basins, Alaska, and Hawaii and other Pacific areas
9. Quality of surface waters of the United States, 1967. Parts 9 and 11, Colorado River basin to Pacific Slope basins in California
10. Quality of surface waters of the United States, 1967. Parts 3 and 4, Ohio River basin and St. Lawrence River basin
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