为什么看到的ISBN条码都是978开头的？ - 知乎
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前缀978和979被分配给了一个虚构的国家“图书之地”，供出版业使用，这样图书的条形码就可以和其他产品上使用的条形码一样。 这些3位前缀 - 978和最终的979是加到13位 国际标准书号 上的新数字，从而使国际标准书号与Bookland的EAN相同。
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