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Aitchison, J.: ¬The thesaurofacet. A multipurpose retrieval language tool (1970)
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Austin, D.: Citation order and linguistic structure (1976)
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- The variety of librarianship. Essays in honor of J. W. Metcalfe. Ed. by W. Boyd Rayward
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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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Austin, D.: ¬The CRG research into a freely faceted scheme (1976)
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Vickery, B.C.: Classificatory principles in natural language indexing systems (1976)
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Wilson, T.D.: ¬The work of the British Classification Research Group (1972)
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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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