Map of Cambridge, with coat of arms at top left and key below the image; illustration to an unidentified publication.  
<br>Etching
<a rel="nofollow" class="external free" href="https://www.britishmuseum.org/collection/object/P_1868-0822-5922">https://www.britishmuseum.org/collection/object/P_1868-0822-5922</a>