ISBN-13 Dual
![isbn13 dual barcode](https://i0.wp.com/www.uslabels.com/wp-content/uploads/isbn13dual.gif?fit=400%2C125&ssl=1)
ISBN numbers are the international order numbers for books.
You find more general information to the ISBN code on the ISBN overview page.
The ISBN-13 Dual is a sub type of the ISBN code which was used in the transition period (01.01.2006-31.12.2006) from ISBN-10 to ISBN-13.