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It is suitable for a variety of printing techniques and is not prone to errors from ink spreading during printing. UPC, EAN, Bookland, and ISSN bar codes are found on retail items scanned at the cash register. Package designers therefore create these bar codes. UPC symbols are also placed on shipping labels, forms, and catalogs. Book covers have a Bookland bar code based on the ISBN number. EAN and JAN bar codes are used outside of the US and Canada, while international periodicals use ISSN bar