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Library of Congress Cataloging
http://www.loc.gov/catdir/
Access information about cataloging at the Library of Congress, as well as, standard practices in cataloging. You can view publications, programs, and products, and search their online catalogs.
Subjects:   Cataloging  

MARC Standards – Library of Congress
http://www.loc.gov/marc/
One stop shopping for information on MARC (MAchine-Readable Cataloging). Site includes general information; MARC formats; MARC in XML; MARC development; and Services, Systems, and tools. Also includes information about MARC Lite.
Subjects:   Cataloging  

Cataloging and Metadata (OCLC)
http://www.oclc.org/services/cataloging/default.htm
OCLC is the place to go if you want online cataloging support. They provide simple, full-service, and custom cataloging. Find out about their products and services, along with other valuable information. OCLC also administers the Dewey Decimal Classification system, which you can access from this Site.
Subjects:   Cataloging