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This field contains the International Standard Book Number (ISBN) copied from subfield ‡a of field 020 (International Standard Book Number) of the MARC bibliographic record that represents the description of the item for which a separate holdings record is created. It may also contain terms of availability and any canceled or invalid ISBN from subfields ‡c and ‡z of field 020 in the bibliographic record. If the bibliographic record contains multiple valid ISBNs that refer to different versions of the item, the one that corresponds to the item described in the holdings statement is used.
Additional information and description of the use of field 020 (International Standard Book Number) is in OCLC Bibliographic Formats and Standards.
An ISBN is a unique number assigned to an item by its publisher. Each ISBN is a ten- or thirteen-digit number and has four parts: the language group of the country of publication, the publisher, the title, and the check character.
Thirteen-digit ISBNs must begin with either 978 or 979 (a 13-digit EAN beginning with 978 or 979 may be input as a valid ISBN).
If printed in a book, catalog or bibliography, these four parts are usually separated by hyphens. Do not enter the hyphens. If the final character is an x, enter an uppercase X.
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