The Policy and Standards Division has made available a comprehensive version of the Descriptive Cataloging Manual (DCM) Z1 and the LC Guidelines Supplement to the MARC 21 Format for Authority Data. These documents are current as of August 1, 2009.
Note to NACO participants: DCM Z1 includes an appendix with instructions specific to Library of Congress staff that may be exluded when printing.
ALA-LC Romanization
Tables in .pdf format (required only if contributing
headings in non-Roman languages)
The underlying principle of NACO is that participants agree to follow
a common set of standards and guidelines when creating or changing
authority records in order to maintain the integrity of a large shared
authority file. During the week of NACO training these guidelines
are discussed and built upon with a view to streamlining processes
while building a consistent and predictable file that will reduce
the duplication of efforts of the global library community and maximize
its resources.