title: issue number on google books api
body: <p>I've been trying to use google books API (V1) to retrieve data about comic books.
  While I'm getting most of the data I need, I seem not to get the issue number. Does anyone who has worked with the books api solve this issue/know how to get it?</p>
  <p>Issue 1 of &quot;Dr. Stone&quot;, italian edition <code>https://www.googleapis.com/books/v1/volumes?q=isbn:8822610768</code></p>
  <p>Issue 2 of &quot;Dr. Stone&quot;, italian edition <code>https://www.googleapis.com/books/v1/volumes?q=isbn:8822610776</code></p>
  <p>As you see there's no way to distinguish them (aside the ISBN, of course) while on info link, directly from the entry <code>https://books.google.it/books?id=ZzYTvgEACAAJ&amp;dq=isbn:8822610768&amp;hl=&amp;source=gbs_api</code> and <code>https://books.google.it/books?id=N_HpwAEACAAJ&amp;dq=isbn:8822610776&amp;hl=&amp;source=gbs_api</code> respectively, it's pretty easy to see the information is there, just not available from the standard api call.</p>