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Top: Reference: Libraries: Library_and_Information_Science: Technical_Services: Cataloguing: Classification: UDC

The Universal Decimal Classification is an indexing and retrieval language in the form of a classification for the whole of recorded knowledge, in which subjects are symbolized by a code based on Arabic numerals. It was designed by the Belgian bibliographers Paul Otlet and Henry Lafontaine at the end of the 19th century, and has been improved and developed ever since.

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