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This is a list of ISBN identifier groups, the second element in 13-digit ISBNs (the first element in 10-digit ISBNs). The identifier is assigned to mark either a publisher's place of business or the language of the books it publishes. The "original" set of identifiers, assigned prior to the introduction of 13-digit ISBNs and, as such, prior to 978-prefix books, ranges from one to five numerical digits according to the following structure: :0-5, 7 :600-649 :80-94 :950-989 :9900-9989 :99900-99999 They are assigned in approximate descending order of publishing volume. Because the smaller identifiers have room for lesser numbers of publishers and ISBNs, several countries have had more than one identifier assigned to them. On the other hand, several countries (Australia, the United States, Canada, France, Austria, Switzerland...) have no identifier because they fall in the "language groups". The structure for the identifiers of the 979- prefix and whether it will have language-specific identifiers is not well known, but three identifiers have been assigned (979-10-, to France, 979-11, to Republic of Korea, and 979-12, to Italy). Also, 979-0 has been reserved for the use of International Standard Music Number for sheet music. ==Identifiers of the 978- prefix== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of ISBN identifier groups」の詳細全文を読む スポンサード リンク
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