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      <field key="002" subkey="a">20070118</field>
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      <field key="037" subkey="b">span.</field>
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      <field key="100" subkey="">$$L000000625$$aReal, Alejandro</field>
      <field key="331" subkey="">Nociones de Historia Natural, para los Ninos de Instruccion Primaria</field>
      <field key="359" subkey="">Alejandro Real</field>
      <field key="410" subkey="">Madrid</field>
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      <field key="433" subkey="">99 S.</field>
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