A quick scan of both pdfs reveals that the former is current as of April 2014. The latter includes July 2014 updates. I have not checked against Catalogers Desktop. Stephen T. Early Cataloger Center for Research Libraries 6050 S. Kenwood Chicago, IL 60637 773-955-4545 x326 [log in to unmask] CRL website: www.crl.edu From: Program for Cooperative Cataloging [mailto:[log in to unmask]] On Behalf Of Ian Fairclough Sent: Tuesday, October 28, 2014 7:03 AM To: [log in to unmask] Subject: [PCCLIST] Internet versions of documents available on Cataloger's Desktop PCCLIST readers, Are the PDF versions of these two documents, as accessed via the links given, still current? 1) Descriptive Cataloging Manual Z1. Name and Series Authority Records http://www.loc.gov/catdir/cpso/dcmz1.pdf (The PDF version appears to have the most recent revisions highlighted in red, with the date of revision at the foot of each page.) 2) LC GUIDELINES SUPPLEMENT TO THE MARC 21 FORMAT FOR AUTHORITY DATA. 2002 Edition with subsequent updates http://www.loc.gov/catdir/cpso/lcmarcsuppl.pdf Both are available via Cataloger's Desktop version. However, some people might access these Internet versions. It is not unknown for documents retrieved via the Internet to have been superseded. Sincerely - Ian Ian Fairclough Cataloging and Metadata Services Librarian George Mason University 703-993-2938 [log in to unmask]<mailto:[log in to unmask]>