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      <marc:subfield code="a">Canadian environmental sustainability indicators : </marc:subfield>
      <marc:subfield code="b">phosphorus levels in the offshore waters of the Great Lakes.</marc:subfield>
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      <marc:subfield code="a">Phosphorus levels in the offshore waters of the Great Lakes</marc:subfield>
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      <marc:subfield code="a">[January 2025 edition].</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">2025.</marc:subfield>
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      <marc:subfield code="c">©2025</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Indicateurs canadiens de durabilité de l'environnement : concentrations de phosphore dans les eaux au large des côtes des Grands Lacs.</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 10-11).</marc:subfield>
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      <marc:subfield code="a">"This indicator presents the status and trends of spring phosphorus levels in the offshore waters of the Canadian Great Lakes. Offshore rather than nearshore phosphorous levels are used because they better represent long-term trends, and are less influenced by local pollutant sources that are found in Lake's nearshore"--Page 5.</marc:subfield>
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      <marc:subfield code="a">Canada. </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">[September 2020 edition]</marc:subfield>
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