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The Thesaurus Project of the Geological Survey of Austria attempts the task of the construction of a controlled vocabulary for the semantic harmonisation of map-based geodata. The content-related realization of this project is governed by the Thesaurus Editorial Team, which consists of thematic experts from the Geological Survey of Austria. Currently there are 4 thematic thesauri available which reflect the basic information of geological maps: lithology, geologic timescale, geologic and tectonic units. All thesauri are available in both German and English* via an open web-application and standardised service interface.