The Geographical Distribution of Plants. Outline of Botanical Geography, The Distribution of Plants in a Perpendicular Direction.
<bdi><a href="https://en.wikipedia.org/wiki/en:Alexander_von_Humboldt" class="extiw" title="w:en:Alexander von Humboldt"><span title="Prussian geographer, naturalist and explorer (1769–1859)">Alexander von Humboldt</span></a>
</bdi>
1850
<a rel="nofollow" class="external text" href="https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~308070~90077931:Geographical-Distribution-of-Plants">The Physical Atlas, A Series of Maps &amp; Illustrations of the Geographical Distribution of Natural Phenomena. Johnston, Alexander Keith, 1850</a>