The English version of the UDC Online is a complete standard edition of the scheme on the Web with over 70,000 classes extended with more than 11,000 records of historical UDC data (cancelled numbers). The UDC Online always shows the latest updated version of the Universal Decimal Classification scheme.

The UDC Online service has a number of features to facilitate searching, browsing, parsing, validating, filing and building of UDC numbers. Searching and viewing of cancelled numbers is intended to help users trace cancelled numbers and their redirections, which may still exist in library collections.

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