http://www.loc.gov/marc/bibliographic/ecbdhome.html You can see the history below the current tag descriptions. Harry -----Original Message----- From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Jonathan Rochkind Sent: Wednesday, January 27, 2010 11:59 AM To: [log in to unmask] Subject: [CODE4LIB] marc documentation? I know I've seen documetnation on the LC site before for since-abandoned marc bib tags, like 400. But I can't for the life of me find it now navigating around the website or googling. does anyone know where this is? Jonathan