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      <record key="001" att1="001" value="LIB904885604" att2="LIB904885604">001   LIB904885604</record>
      <field key="010" subkey="">LIB904884600</field>
      <field key="037" subkey="x">englisch</field>
      <field key="050" subkey="x">Aufsatz, Sammelband</field>
      <field key="090" subkey="">011</field>
      <field key="100" subkey="">hausman, jerry a.</field>
      <field key="103" subkey="">massachusetts institute of technology, cambridge, massachusetts</field>
      <field key="104" subkey="a">wise, david a.</field>
      <field key="107" subkey="">harvard university, cambridge, massachusetts</field>
      <field key="331" subkey="">stratification on endogenous variables and estimation: the gary income maintenance experiment</field>
      <field key="544" subkey="n">9767-A;11</field>
      <field key="596" subkey="a">365 - 391</field>
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