World Reference Base
The World Reference Base (WRB) is the international standard for soil classification system endorsed by the International Union of Soil Sciences. It was developed by an international collaboration coordinated by the IUSS Working Group. It replaced the FAO/UNESCO Legend for the Soil Map of the World as international standard. The WRB borrows heavily from modern soil classification concepts, including Soil Taxonomy, the legend for the FAO Soil Map of the World 1988, the Référentiel Pédologique and Russian concepts. As far as possible, diagnostic criteria match those of existing systems, so that correlation with national and previous international systems is as straightforward as possible.
World reference base for soil resources, 1998
also available in French, Italian, Japanese, Lithuanian, Rumanian, Vietnamese
World reference base for soil resources, 2006
also available in Arabic, German, Polish, Russian, Slovak, Spanish, Turkish
NEW ! World reference base for soil resources, 2014