I prefer this one, from 1975 Coevolution Quarterly, by
Miklos Udvardy and Theodore Oberlander:<p><a href="https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~231745~5509023:World----Biogeographical-Provinces" rel="nofollow">https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~2...</a>
Still a dilettante at bioregional thinking, but FWIW another eco region map I’ve been staring at lately has been WWF’s: <a href="https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world" rel="nofollow">https://www.worldwildlife.org/publications/terrestrial-ecore...</a> .<p>It’s intended for ESRI but can also be imported into Google Earth.