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OCLC number is a variable-length numeric string with leading zeros for numbers with less than 8 digits and no leading zeros for those with 8 or more digits. Note: Field 019 contains the OCLC control number of a deleted or merged record replaced by the current one.

MARC 21 field 001 is implemented in OCLC-MARC as the OCLC Control Number (OCLC) fixed field element. It contains the OCLC control number that is system-generated and assigned by OCLC. The field 001 does not have indicators or subfield codes. MARC 21 field 003 does not display in current OCLC interfaces.

Search for an unresolved record From the Data Type drop-down list, select Bibliographic Records. From the Index drop-down list, select OCLC Number. Enter the OCLC number for the unresolved record in the Term(s) text field. Click Search.

For control numbers assigned under LCCN structure A, the year portion consists of two digits representing the year the control number was assigned. In most numbers, the year portion reflects the year in which the LC control number was assigned to the record for the bibliographic item.

The OCLC Control Number is a unique, sequentially assigned number associated with a record in WorldCat. The number is included in a WorldCat®record when the record is created. The OCLC Control Number can be found in MARC fields 001, 019, and 035 as follows.

The OCLC Control Number is a unique, sequentially assigned number associated with a record in WorldCat. The number is included in a WorldCat®record when the record is created. The OCLC Control Number can be found in MARC fields 001, 019, and 035 as follows.

A Library of Congress catalog card number is a unique identification number that the Library of Congress assigns to the catalog record created for each book in its cataloged collections.