What classification system does the Library of Congress use?
The Library of Congress classifies books according to the Library of Congress Classification (LCC) system. An outline of LCC is available on the Library’s Web site. The complete text of the classification schedules in printed volumes may be purchased from the Cataloging Distribution Service. Online access to the complete text of the schedules is available through Classification Web, a subscription product that may also be purchased from the Cataloging Distribution Service.