Duplicate ISBN Issue

[Jack Kirby and the X-man]

I've found a book with the same ISBN as an existing Goodreads record. It appears that the publisher (ABC Books) has used the same ISBN for two books. As a check I searched on the National Library of Australia catalogue - and it seems to have been used twice.

The ISBN in question is 9780733321023, which seems to refer to both:
Lily Quench and the Dragon of Ashby (Lily Quench)
and the book I'm adding:
Sydney of the Antarctic.

At this stage I've added Sydney of the Antarctic, but have left the ISBN blank. Is there anything more I need to do? Maybe include a librarian note, or maybe put the ISBN in the description field?

[rivka, Former Moderator]

Jack Kirby and the X-man wrote: "Maybe include a librarian note, or maybe put the ISBN in the description field?"

Both would be good.