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Lists of additions and changes to the Library of Congress Classification (LCC) are posted on the Cataloging and Acquisitions Web site as they are approved. Currently there are generally twelve approved lists each year. Prior to List 21, 2011, there were generally fifty-one lists each year, with no list published for the final week of December.
The information in the weekly lists was formerly made available in a quarterly publication entitled LC Classification: Additions and Changes. That publication ceased with List 284 (October- December 2001).
The online product Classification Web is the official and up-to-date version of the Library of Congress Classification. Classification Web is available by subscription from the Cataloging Distribution Service.