Harry Potter and the Deathly Hallows multiple "First Editions" with different ISBNs

[The Elusive]

I have a copy before me of
http://www.goodreads.com/book/show/82...
, with ISBN13 9780747591054 which claims to be the First Edition in the copyright page.

But I also found
http://www.goodreads.com/book/show/81...
with ISBN13 9781551929767 and all other data the same as my copy, including a a publication date of "July 21st 2007"

and

http://www.goodreads.com/book/show/23..., with ISBN13 9780747595830 which has "Bloomsbury; 1ST edition (2008)" as publisher (but claims to be a 2008 reprint)

[vicki_girl]

Doing some googling, it appears that the second book you listed (ISBN13 9781551929767), is the first Canadian edition. Since the release was worldwide, it would have had the same release date as the first UK edition, the first US edition, etc.

[The Elusive]

And each one gets its own ISBN. OK. I guess it would be a good idea to add a note to avoid confusion.