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language_ss:"e"
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theme_ss:"Beziehungen verbale / systematische Erschließung"
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type_ss:"m"
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year_i:[1970 TO 1980}
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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 science, culture and communication (1977)
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