Library Home: Dewey Decimal Classification to Library of Congress Classification: LCC to DDC

Note about this Guide

This guide exists as a self-help reference resource. We are unable to provide any cataloging assistance or answer cataloging questions.

About this Page

Northwestern's library is classified in Dewey. If you have a book with a Library of Congress classification number and you'd like to find the corresponding number in the Dewey Decimal classification, check out the tables linked below.

Mapping Library of Congress Numbers to Dewey Decimal Numbers

Library of Congress vs. Dewey Decimal Table
An expanded table of LC to DD classifications created by Kilgore College.
Map an LC number to a Dewey number
The following table is provided by QuestionPoint.

Search by Title, Author, Subject Heading, or Standard Number

Search Worldcat.org
Search WorldCat for the book and click-through to library catalogs to see what call number they list. This method may prove more successful for some books than the LC catalog search.
Search the LC Catalog
Search by title of the work to find its entry in the LC Catalog in which you may find listed LC call numbers and DD class numbers. Not all books in the LC Catalog will have this information listed, and you may be unable to find recently published works.
http://classify.oclc.org/classify2
NOTE: Classify was discontinued on January 31, 2024. OCLC Cataloging and Metadata subscribers can use WorldShare Record Manager or the WorldCat Metadata API, available as part of the subscription, to perform similar searches to find classification numbers.