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1
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2Published 1981Subjects: “...Petroleum industry and trade North America Statistics Periodicals....”
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3Published 1970Subjects: “...Petroleum industry and trade North America Statistics Periodicals....”
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4Published 1970Subjects: “...Chemical industry North America Statistics Periodicals....”
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5Published 1970Subjects: “...Chemical industry North America Statistics Periodicals....”
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6
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7