The Program for Cooperative Cataloging has issued the following guidelines
for implementing the recent decision to make field 440 obsolete. The PCC
recommends that members implement this change beginning Oct 24, 2008.

http://www.loc.gov/catdir/pcc/Field440.pdf

Sincerely
Les Hawkins
CONSER Coordinator
Library of Congress
Washington, DC 20740
v. 202 707-5185
lhaw@loc.gov