Most books have a Bookland EAN barcode, which is the ISBN prepended by 978, and with the check-digit recalculated. Most mass-market paperbacks have their Bookland barcode on the inside front cover, and sport a 12-digit "grocery" code on the back.
After the first, all new ISBNs will be ISBN13, which is the exact same as Bookland EAN.
Also, for books, the ASIN (Amazon #) is the same as the ISBN.