<li>Illustration XVIII (<a idref="sect320">Section 320</a>)</li>
<li>Illustration XIX (<a idref="sect337">Section 337</a>)</li>
<li>Illustration XX (<a idref="sect342">Section 342</a>)</li>
<li>Illustration XVIII (<a idref="sect320">Section 320</a>)</li>
<li>Illustration XIX (<a idref="sect337">Section 337</a>)</li>
<li>Illustration XX (<a idref="sect342">Section 342</a>)</li>