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Root thesaurus. Pt.1.2 (1985)
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Foskett, D.J.: Classification for a general index language: a review of recent research by the Classification Research Group (1970)
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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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Thesaurofacet: a thesaurus and faceted classification for engineering and related subjects (1969)
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