Map of the Canton River and adjacent islands. The inset shows the position of British ships comprising the advanced squadron on 26 May 1841.
Isaac Purdy
William Dallas Bernard; William Hutcheon Hall (1844). <i><a rel="nofollow" class="external text" href="http://www.elibron.com/maps/?msg_id=172640">Narrative of the Voyages and Services of the Nemesis, from 1840 to 1843</a></i>. Volume 1. London: Henry Colburn.