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What happens to ISMNs that have already been obtained by a publisher but are not yet assigned?

April 26, 2017happens ismns obtained publisher

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What happens to ISMNs that have already been obtained by a publisher but are not yet assigned?

1 Answer

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The publisher should continue to use these until they are exhausted but must convert the number formats to the new 13-digit standard, prefixed by 979, and replace the M- by 0- (zero). E.g. ISMN M-345-24680-5 is converted to ISMN 979-0-345-24680-5.