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Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social and human science, culture and communication and information (1995)
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Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture and communication (1977)
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Root thesaurus. Pt.1.2 (1985)
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- Date
- 18. 5.2007 14:22:43