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Non-working URL's can be searched in http://archive.org . I suspect that GPO uses non-working URL's to search for archived federal websites such http://permanent.access.gpo.gov/lps126327/1993/mq23a935.txt Apologies if someone already pointed this out. Thanks Tim 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]]<mailto:[mailto:[log in to unmask]]> On Behalf Of Steven C Shadle Sent: Monday, May 21, 2012 5:04 PM To: [log in to unmask]<mailto:[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 ...