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      <field key="010" subkey="">LIB904286605</field>
      <field key="037" subkey="x">deutsch</field>
      <field key="050" subkey="x">Aufsatz, Sammelband</field>
      <field key="090" subkey="">021</field>
      <field key="100" subkey="">kuepper, hans-ulrich</field>
      <field key="331" subkey="">rationalprinzip</field>
      <field key="544" subkey="n">8794-A;21</field>
      <field key="596" subkey="a">139 - 142</field>
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