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      <marc:subfield code="a">Canadian environmental sustainability indicators : </marc:subfield>
      <marc:subfield code="b">population status of Canada’s migratory birds.</marc:subfield>
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      <marc:subfield code="a">Population status of Canada’s migratory birds</marc:subfield>
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      <marc:subfield code="a">Population status of Canada’s migratory birds : </marc:subfield>
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      <marc:subfield code="a">[Gatineau, QC] : </marc:subfield>
      <marc:subfield code="b">Environment and Climate Change Canada = Environnement et Changement climatique Canada, </marc:subfield>
      <marc:subfield code="c">2019.</marc:subfield>
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      <marc:subfield code="c">©2019</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Indicateurs canadiens de durabilité de l'environnement : situation des populations d’oiseaux migrateurs du Canada.</marc:subfield>
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      <marc:subfield code="a">"December 2019."</marc:subfield>
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      <marc:subfield code="a">Bird populations</marc:subfield>
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      <marc:subfield code="a">Environmental indicators</marc:subfield>
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      <marc:subfield code="t">Indicateurs canadiens de durabilité de l'environnement : </marc:subfield>
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      <marc:subfield code="t">Canadian environmental sustainability indicators : </marc:subfield>
      <marc:subfield code="b">May 2025</marc:subfield>
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      <marc:subfield code="t">Data sources and methods for the population status of Canada's migratory birds indicator </marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
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