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UDC: Universal Decimal Classification

Universal Decimal Classification (UDC) is a bibliographic and library classification system developed by the Belgian bibliographers Paul Otlet and Henri La Fontaine in 1905 which work as an elaborate expansion of Dewey Decimal Classification (DDC) in which symbols are used in addition to Arabic numerals to create longer notations, making it more flexible and precise than DDC and particularly suitable for the classification of specialized collections. International Federation for Information and Documentation (FID) remained for many years the centre for the management and maintenance of UDC but from the year 1991, the job is handed over to the UDC Consortium (UDCC).

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