Diane,

You may want to look at the OCLC Union List Guidelines for Electronic
Serials. That won't tell you which libraries are following a given practice,
but it does give some suggested models for creating Lars.

http://www.oclc.org/oclc/union/eserials.shtm

Hope it's helpful,

Naomi Young

Naomi Kietzke Young ** Head, Serials Cataloging
Resource Services, University of Florida
PO Box 117007 Gainesville, FL 32611-7007
Phone: (352) 392-0355 ext. 234 ** Fax: (352) 392-7365
naomi@mail.uflib.ufl.edu.eddo