title: How to retrieve full subject list from the Google Books API?
body: <p>When I perform a <code>Volume: get search</code> or a <code>Volume: list</code> using the Google Books API, I'm not getting the full subject list back. <a href="https://www.googleapis.com/books/v1/volumes/cTiYAgAAQBAJ" rel="noreferrer">The API returns</a>:</p>
  
  <pre><code>categories: [
      "Fiction / General"
  ],
  </code></pre>
  
  <p>And <a href="https://books.google.ca/books/about/The_Miniaturist.html?id=LjhOnwEACAAJ&amp;redir_esc=y" rel="noreferrer">this is what the Google Books record shows</a>:</p>
  
  <pre><code>Subjects
  Fiction &gt; Thrillers &gt; Suspense
  
  Fiction / Historical
  Fiction / Literary
  Fiction / Thrillers / Suspense
  </code></pre>
  
  <p>Has anyone encountered this before and knows how I can get this full subject list back?</p>