Quality of surface waters of the United States, 1968, Parts 9 and 10, Colorado River basin and the Great Basin
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Quality of surface waters of the United States, 1969, Parts 9 and 10, Colorado River basin and the Great Basin
1966 ◽
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1959 ◽
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1954 ◽
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1959 ◽
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1961 ◽
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