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- http://vocabularies.unesco.org/thesaurus/concept1971 1
- http://vocabularies.unesco.org/thesaurus/concept1972 1
- http://vocabularies.unesco.org/thesaurus/concept1973 1
- http://vocabularies.unesco.org/thesaurus/concept1974 1
- http://vocabularies.unesco.org/thesaurus/concept1975 1
- http://vocabularies.unesco.org/thesaurus/concept1976 1
- http://vocabularies.unesco.org/thesaurus/concept1977 1
- http://vocabularies.unesco.org/thesaurus/concept1978 1
- http://vocabularies.unesco.org/thesaurus/concept1979 1
- http://vocabularies.unesco.org/thesaurus/concept1980 1
- http://vocabularies.unesco.org/thesaurus/concept1981 1
- http://vocabularies.unesco.org/thesaurus/concept1982 1
- http://vocabularies.unesco.org/thesaurus/concept1983 1
- http://vocabularies.unesco.org/thesaurus/concept1984 1
- http://vocabularies.unesco.org/thesaurus/concept1985 1
- http://vocabularies.unesco.org/thesaurus/concept1986 1
- http://vocabularies.unesco.org/thesaurus/concept1987 1
- http://vocabularies.unesco.org/thesaurus/concept1988 1
- http://vocabularies.unesco.org/thesaurus/concept1989 1
- http://vocabularies.unesco.org/thesaurus/concept1990 1