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      <marc:subfield code="a">Marsalek, J., </marc:subfield>
      <marc:subfield code="e">author.</marc:subfield>
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      <marc:subfield code="a">Modelling agriculture runoff : </marc:subfield>
      <marc:subfield code="b">overview / </marc:subfield>
      <marc:subfield code="c">by J. Marsalek.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="264" ind1=" " ind2="1">
      <marc:subfield code="a">Burlington, Ontario : </marc:subfield>
      <marc:subfield code="b">Rivers Research Branch, National Water Research Institute, </marc:subfield>
      <marc:subfield code="c">1988.</marc:subfield>
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      <marc:subfield code="a">NWRI contribution ; </marc:subfield>
      <marc:subfield code="v">no. 89-109</marc:subfield>
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      <marc:subfield code="a">Digitized edition from print [produced by Environment and Climate Change Canada].</marc:subfield>
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      <marc:subfield code="a">"October 1988."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references.</marc:subfield>
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      <marc:subfield code="a">"Approaches to the modelling of agricultural runoff pollution are examined, starting with the modelling objectives and the level of analysis, followed by model implementation, and overview of existing models. Further refinements of the modelling process and of the existing models are proposed"--Abstract.</marc:subfield>
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      <marc:subfield code="a">Canada. </marc:subfield>
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      <marc:subfield code="a">National Water Research Institute (Canada). </marc:subfield>
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      <marc:subfield code="a">NWRI contribution ;</marc:subfield>
      <marc:subfield code="v">no. 89-109.</marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-89-109-eng.pdf</marc:subfield>
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