Non-working URL’s can be searched in .  I suspect that GPO uses non-working URL’s to search for archived federal websites such 


Apologies if someone already pointed this out.






Tim Watters

Special Materials Cataloger

Library of Michigan

702 West Kalamazoo St

P.O. Box 30007

Lansing, MI 48909-7507

Tel: 517-373-3071

e-mail: [log in to unmask]


-----Original Message-----


From: Program for Cooperative Cataloging [mailto:[log in to unmask]] On Behalf Of Steven C Shadle

Sent: Monday, May 21, 2012 5:04 PM

To: [log in to unmask]

Subject: Re: [PCCLIST] Question re invalid URLs in 856


Greta -- TBH, I have no idea why there are different practices or what the purpose was of leaving the non-working URL in 856|u …