You will no doubt have noticed in copy that ISBN numbers are changing from 10 to 13 digits. By January 2007 all publishers should have switched. In the interim period, you may see both types of ISBN numbers in copy. Here are the procedures to follow:
If the copy has two ISBNs each in a 020 then leave it as is.
If the copy has two ISBNs and the 13 digit ISBN is in an 024 tag instead of an 020 tag then modify the 024 by changing it to an 020 tag and make it the first 020 tag in the record
A cataloguing memo with more details and examples will follow and at the January Bib Services Department meeting there will be a cataloguing minibyte on the same topic.
Procedures for treatment of the13 digit ISBN in original cataloguing will follow.
Please see Heather if you have any questions.