AUTOCAT listserv on cataloging and authority control.
Cataloger's Reference Shelf by the Library Corporation
DDC summaries
Dewey Decimal Classification products and services offered by OCLC.
GSAFD file
LCSH weekly updates
Library of Congress
Library of Congress authorities
MARC bibliographic format
MARC code list for countries
MARC code list for geographic areas
MARC code list for languages
MARC code list for organizations
Tag of the month by Follett software
TUTORIALS
MARC Authority Tutorial by the Bibliographic Services Department of the Cook Library at the University of Southern Mississippi.
MARC 21 Tutorial by the Bibliographic Services Department of the Cook Library at the University of Southern Mississippi.
Understanding MARC authority records : machine-readable cataloging from the Library of Congress.
Understanding MARC bibliographic : machine-readable cataloging from the Library of Congress.