xt output_subarea output_execute_result">
<pre>Index([&#39;filepath&#39;, &#39;pub_date&#39;, &#39;page_seq_num&#39;, &#39;edition_seq_num&#39;, &#39;batch&#39;,
       &#39;lccn&#39;, &#39;box&#39;, &#39;score&#39;, &#39;ocr&#39;, &#39;place_of_publication&#39;,
       &#39;geographic_coverage&#39;, &#39;name&#39;, &#39;publisher&#39;, &#39;url&#39;, &#39;page_url&#39;],
      dtype=&#39;object&#39;)</pre>
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