OCLC Union Listing

What it is

Means by which libraries describe their changing collections
Initially designed to enhance serials resource sharing
You can create LDRs for any bibliographic format
More OCLC Union List Information at:

http://www.oclc.org/oclc/menu/union.htm

The official OCLC Union List Manual is at:

http://www.oclc.org/oclc/man/4141ulug/toc.htm