<a href="//commons.wikimedia.org/wiki/Botanical_Garden_Bonn" class="mw-redirect" title="Botanical Garden Bonn">Botanical Garden Bonn</a>, engraving, 1823
G. Osterwald, W. Sinning
Original: 1823
Helga Stoverock: <i>Der Poppelsdorfer Garten - vierhundert Jahre Gartengeschichte</i>, Dissertation at Bonn University (<a rel="nofollow" class="external autonumber" href="http://hss.ulb.uni-bonn.de/diss_online/phil_fak/2001/stoverock_helga/0242.pdf">[1]</a>)