The fact that the last two numbers (before the check-digit) is two digits "82" indicates a block of 100 ISBNs was purchased, which means a small to medium size publisher. I would reach out to them by email and indicate a production error has occurred in the product line. There's really no other recourse and hopefully they have (or did) re-issue it with a new, unique ISBN. Having purchased blocks of 100 and 1000 ISBNs, I am familiar with all the ways one can goof it up. Victor

On 12/11/2025 11:38 AM EST deltonlib--- via Michlib-l <michlib-l@liblists.org> wrote:

Hi!

Has anyone ever run in to an issue where two books have the same ISBN? We have never seen it before, until yesterday. Two books in a series have the same ISBN: 978-1-961302-82-2. We were trying to catalogue the second book in the series, and our system flagged the ISBN as already having a record. Any insight on what should be done for cataloguing the second book?

Thanks!

Marie

Marie Tsuji

Delton District Library

330 N. Grove St, Delton, MI 49046

269-623-8040

www.deltonlib.org https://email.ionos.com/appsuite/www.deltonlib.org

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