Required if applicable Definition ISSN national centers use field 222 for a unique title assigned to a serial in conjunction with an International Standard Serial Number in field 022. The title is formed from title information transcribed from a piece of the serial and is constructed with qualifiers to make it unique when necessary.
National centers assign ISSNs and key titles.
You may enter the ISSN and key title if you are inputting a new record and the ISSN and key title are clearly labeled on the item. If you are inputting a record for a reproduction, you may transfer the ISSN and key title from the record for the original item to the record for the reproduction. Omit final punctuation unless the last word in the field is an abbreviation or closing parenthesis. First indicator Blank. The key title.