g challenged and the characteristics of these books 
were collected from the American Library Society. State-level demographic information and 
political leanings were obtained from the US Census Bureau and Cook Political Report, respectively.
Due to an outlying large number of challenges, book challenges made in the state of Texas 
were omitted.</p>
    </div>

    <div id="ref-usage">
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="va">book_banning</span></code></pre></div>
    </