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  1. Mar 2022
  2. www.ifla.org www.ifla.org
    National Bibliography Number (NBN)
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    1. kael 20 Mar 2022
      urn id nbn library wikipedia:en=National_Bibliography_Number urn:ietf:rfc:8458
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    ifla.org/wp-content/uploads/2019/05/assets/bibliography/national_bibliography_number.pdf