When the CDL expanded displays in the California Periodicals database to include the CULP and SERHOLD locations, a feature was added that allows users to display holdings within a geographic region of California defined by the Library of California.  The Center for Research Libraries (CRL) located in Chicago, Illinois is the only institution that does not have a logical regional location in this model.  CRL lends to member libraries and the University of California is a member of CRL; thus, CRL is included with any of the regions that also include a UC campus.  Items with only CRL holdings will show up in all of the regions that contain UC campuses.  At times CRL is the only location for a region.