Quality of surface waters of the United States, 1960, Parts 5 and 6, Hudson Bay and Upper Mississippi River basins, and Missouri River basin
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1962 ◽
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1970 ◽
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1969 ◽
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1963 ◽
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1971 ◽
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1958 ◽
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1961 ◽
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1957 ◽
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1958 ◽
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1966 ◽
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