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Doorn, M. van; Polman, K.: From classification to thesaurus ... and back? : subject indexing tools at the library of the Afrika-Studiecentrum Leiden (2010)
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Pika, J.: Universal Decimal Classification at the ETH-Bibliothek Zürich : a Swiss perspective (2007)
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Vasiljev, A.: Thesaurus project of the Delft University of Technology Library : Allgemeiner Thesaurus für Bibliotheken (1982)
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Veltman, K.: Thougths on the reorganization of knowledge (1983)
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Goldberg, E.: ¬The retrieval problem in photography (1932) (1992)
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