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- http://vocabularies.unesco.org/thesaurus/concept1953 1
- http://vocabularies.unesco.org/thesaurus/concept1954 1
- http://vocabularies.unesco.org/thesaurus/concept1955 1
- http://vocabularies.unesco.org/thesaurus/concept1956 1
- http://vocabularies.unesco.org/thesaurus/concept1957 1
- http://vocabularies.unesco.org/thesaurus/concept1958 1
- http://vocabularies.unesco.org/thesaurus/concept1959 3
- http://vocabularies.unesco.org/thesaurus/concept196 1
- http://vocabularies.unesco.org/thesaurus/concept1960 1
- http://vocabularies.unesco.org/thesaurus/concept1961 1
- http://vocabularies.unesco.org/thesaurus/concept1962 1
- http://vocabularies.unesco.org/thesaurus/concept1963 1
- http://vocabularies.unesco.org/thesaurus/concept1964 1
- http://vocabularies.unesco.org/thesaurus/concept1965 1
- http://vocabularies.unesco.org/thesaurus/concept1966 1
- http://vocabularies.unesco.org/thesaurus/concept1967 1
- http://vocabularies.unesco.org/thesaurus/concept1968 1
- http://vocabularies.unesco.org/thesaurus/concept1969 1
- http://vocabularies.unesco.org/thesaurus/concept197 2
- http://vocabularies.unesco.org/thesaurus/concept1970 1