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      <marc:subfield code="a">Thompson, Mary E., </marc:subfield>
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      <marc:subfield code="a">The cation denudation rate as a quantitative index of sensitivity of eastern Canadian rivers to acidic atmospheric precipitation / </marc:subfield>
      <marc:subfield code="c">Mary E. Thompson.</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 18).</marc:subfield>
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