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UDC Consortium, PO Box 90407, 2509 LK
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Cancellations from the UDC Master Reference File
In the process of revision of the UDC, numbers from the schedules are cancelled annually. This is first published in the Extensions and Corrections to the UDC every November. Following publication, class numbers are removed from the UDC Master Reference File. See also the list of major changes to the UDC since 1993 and subject coverage statistics. If you wish to view the cancellations in any particular year, please click on the year.
Some of the older text files are structured and tagged in order to help publishing and editing, if this is the case, the interpretation of these tags is as follows:
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