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      <marc:subfield code="a">Hypolimnetic oxygen depletion in Central Lake Erie </marc:subfield>
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      <marc:subfield code="a">"A new analysis of hypolimnetic oxygen in central Lake Erie indicates that historic increases in the apparent depletion were not as great as formerly believed. The differences that did occur were mostly related to variations in hypolimnion thickness"--Abstract.</marc:subfield>
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