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    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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    xmlns="http://www.loc.gov/MARC21/slim">

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  <controlfield tag="000">     nam a22     7a 4500</controlfield>
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    <subfield code="a">Teor&#xED;a de la competencia monop&#xF3;lica</subfield>
    <subfield code="c">E.H. Chamberlin</subfield>
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    <subfield code="a">2a</subfield>
  </datafield>
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    <subfield code="b">FCE</subfield>
    <subfield code="c">1956</subfield>
  </datafield>
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    <subfield code="c">48317</subfield>
    <subfield code="d">48317</subfield>
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