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2
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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 / comp. by Jean Aitchison.
- UNESCO,
- cop. 1977.
- Paris :
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Communication and rural development / Juan E. DÃaz Bordenave.
- UNESCO,
- cop. 1977.
- Paris :