Add more content

cce_search/templates/about.html

@@ -12,6 +12,14 @@ posts: <a href="https://www.nypl.org/blog/2018/03/30/unlocking-record-american-c
 the Record of American Creativity—with Your Help</a>
 and <a href="https://www.nypl.org/blog/2019/05/31/us-copyright-history-1923-1964">https://www.nypl.org/blog/2019/05/31/us-copyright-history-1923-1964</a></p>
 
+<p>Renewals have been searchable for many years thanks to the <a href="https://exhibits.stanford.edu/copyrightrenewals?forward=home">Copyright Renewals project</a> at Stanford. The digitization of <em>registrations</em> by NYPL allows us to find renewed and <em>unrenewed</em> works with equal ease. Search results in this interface contain registrations with their associated renewals, registrations with no known renewals, as well as renewal entries on their own.</p>
+
+<h2>What's in the Data?</h2>
+
+<p>This dataset contains registrations from all the book volumes of the <i>Catalog of Copyright Entries</i>, 1923 to 1969, but <em>not including</em> the “pamphlet” volumes (part 1, group 2) from 1923 to 1953. It contains all renewals from book volumes from 1923 to 1977, including “pamphlet” volumes (from Project Gutenberg transcriptions) and all renewals from <em>all classes</em> of works from 1978 to 1991 (from the Copyright Office database).</p>
+
+<p>Clearly there are many renewal records for items not yet included in the registrations but, in theory, <em>all</em> book renewals should be included here. That said, these search results are far from definitive. The data still requires cleanup (see <a href="#reporting-errors">How to report a problem or error</a> below).</p>
+
 <h2 id="reporting-errors">How to report a problem or error</h2>
 
 <p>If the problem is with this website and not the data, for instance broken