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      <marc:subfield code="a">Vandenberg, A., </marc:subfield>
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      <marc:subfield code="a">Program FRONT : </marc:subfield>
      <marc:subfield code="b">two-dimensional simulation of a moving intrusion front in a thin horizontal confined aquifer / </marc:subfield>
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      <marc:subfield code="a">"Contract No. KL 398-5-8027."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 20).</marc:subfield>
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