However, following the publication of John Stanley Beard's phytogeographic regionalisation of Western Australia in 1980, it was recognised that Hopper's zones could be defined as aggregates of Beard's botanic districts.
The best known of these are the Interim Biogeographic Regionalisation for Australia (IBRA) regions, and the World Wildlife Fund's Ecoregions in Australia, and the "natural regions" of John Stanley Beard, all of which are based on biogeography.
Beard, J. S. (1944) The natural vegetation of Tobago, British West Indies.
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