Excuse me, how is the bar code (not isbn code) generated in the book? \x0d\ The barcode of the book is generated according to the ISBN number. Many design typesetting tools will have the function of generating book bar code, but the premise is to have ISBN number. \x0d\ Is there a special management department similar to ISBN? \x0d\ The answer is the same as above. The barcode is consistent with ISBN number and managed by CIP Data Management Center of China Map Library. \x0d\ Is it possible to duplicate the bar codes of two books? \x0d\ Because ISBN numbers are not duplicated, barcodes are not duplicated. \x0d\ Why did the previous bar codes all start with 978, and now there is suddenly a 979? \x0d\ Someone has answered this question before, and 979 is also a number allowed by domestic books, but it is rarely used at ordinary times. \x0d\ Can I start with 980 or 999? Does anyone care? \ x0d \No. The reason is as mentioned above. Will \x0d\ affect my business? \x0d\ Because you can't apply for the China ISBN with such a beginning, it depends on your business type. \ x0d \ x0d \ supplement12007-05-1712: 43 \ x0d \ why did everyone only use 978 before, but now they are using 97438? Haven't you used up the number of 978?