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The UNESCO Thesaurus is a controlled and structured list of terms used in subject analysis and retrieval of documents and publications in the fields of education, culture, natural sciences, social and human sciences, communication and information. Continuously enriched and updated, its multidisciplinary terminology reflects the evolution of UNESCO's programmes and activities. [from homepage]

Service Categories (KCDB). This service shows the related service categories for the Key Comparisons DataBase (KCDB) by quantity.

Ontology, part of the SI Reference Point, covering measurement units (SI base units and SI units with special names) and prefixes.