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      <marc:subfield code="a">Etkin, David, </marc:subfield>
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      <marc:subfield code="a">Enhanced greenhouse warming : </marc:subfield>
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      <marc:subfield code="c">by David Etkin.</marc:subfield>
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      <marc:subfield code="a">Canadian Climate Centre report ; </marc:subfield>
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      <marc:subfield code="a">Canadian Climate Centre report ;</marc:subfield>
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