|First Indicator||Second Indicator|
|Type of standard number or code
0 - International Standard Recording Code
1 - Universal Product Code
2 - International Standard Music Number
3 - International Article Number
4 - Serial Item and Contribution Identifier
7 - Source specified in subfield $2
8 - Unspecified type of standard number or code
# - No information provided
0 - No difference
1 - Difference
Standard number or code published on an item which cannot be accommodated in another field (e.g., field 020 (International Standard Book Number), 022 (International Standard Serial Number) , and 027 (Standard Technical Report Number)). The type of standard number or code is identified in the first indicator position or in subfield $2 (Source of number or code).
First Indicator - Type of standard number or code
Type of standard code in the field.
Source of the number or code is specified in subfield $2 (Source of number or code).
Type of standard number or code is unspecified.
Second Indicator - Difference indicator
Whether there is a difference between a scanned number or code and the same number or code in eye-readable form.
No information is provided as to whether the number or code in the field appears in the same form in both scanned and eye-readable form. It is also used when the eye-readable number or code does not appear in a form adequate for scanning, thus the aspect of difference does not apply.
Scanned number or code is the same as the number or code in eye-readable form.
Scanned and eye-readable versions of a number or code differ.
[Eye-readable SICI for the article "Quality: Theory and Practice." AT&T Technical Journal, v. 65, issue 2, (Mar.-Apr. 1986), p. 4.]
[Scanned SICI for the same article. Both the eye-readable and the scanned SICIs appear in the same record.]
$a - Standard number or code
$c - Terms of availability
Price or a brief statement of availability and any parenthetical qualifying information pertaining to an item associated with a number being recorded in the field. Information is only recorded in this subfield when a number is present in subfield $a.
$d - Additional codes following the standard number or code
Any optional digits carried to the right of the number or code, such as digits provided to identify price, title, or issue information.
$z - Canceled/invalid standard number or code
Any canceled and/or invalid standard numbers or codes. If a valid number or code of the same type is not known, subfield $z may appear alone in field 024.
$2 - Source of number or code
MARC code that identifies the source of the number or code. Used only when the first indicator contains value 7 (Source specified in subfield $2).
Code from: Standard Identifier Source Codes.
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.
Punctuation - Field 024 does not end with a mark of punctuation.
Structure - ISRC usually appears on an item preceded by the letters ISRC. It consists of twelve alphanumeric characters structured as four elements separated by hyphens: 1) country; 2) first owner; 3) year of recording; and 4) recording. The country codes consists of two letters as specified in Codes for the Representation of Names of Countries (ISO 3166). The first owner code is alphanumeric and consists of three characters. The year of recording code consists of the last two digits of the year (e.g., 82 for 1982). The recording code consists of five digits and is assigned sequentially by the first owner.
Display Constants - Initialism ISRC, the phrase ISRC (invalid), and the internal hyphens are not carried in the MARC record. They may be system generated as display constants associated with first indicator value 0 and the content of subfields $a and $z, respectively.
Display example:ISRC NL-C01-84-13261 ISRC (invalid) NL-C01-84-03261
Structure - UPC appears as a bar-code symbol with 12 digits printed below it. Hyphens or spaces susually separate the elements of the number on the item. The code has three basic parts. 1) The first digit is the Number System Character (NSC) which appears on the left side of the symbol outside of the bars. 2) The next ten digits encoded in the symbol are shown below the bars. 3) The twelfth digit is a check digit and usually appears at the bottom right of the symbol. All digits as found on the piece are input into MARC.
For audio and video products, the ten digits of part 2), printed below the parallel bars, consist of three elements: a five-digit manufacturer designation to designate the manufacturer assigned by the Uniform Code Council; a five-digit selection number; and a single-digit configuration number. The fifth digit of the first element serves as both the last digit of the manufacturer designation and the first digit of the selection number. The tenth digit (configuration number) indicates the format of the product.
For serials, the five digits after the NSC identify the publisher or distributor. The next five digits encode a BIPAD title identification number which uniquely identifies each publication. A two-character supplemental symbol designating a specific issue may follow the number.
For paperback books, there are two bar-coding structures. The ten digits of part 2) may consist of a five digit identifier for the publisher and the next five digits contain the title portion of the International Standard Book Number (ISBN). For the other, the first five digits of part 2) identify the publisher or the bookline, the next five digits represent a cover price or a price category. Five add-on digits may follow part 3); they are derived from the title portion of the ISBN.
Display Constants - UPC is carried in the MARC record without the internal hyphens or spaces. Hyphens, spaces and introductory words may be system generated as display constants associated with first indicator value 1 and the content of subfields $a, $d, and $z.
[UPC for a paperback book]
Display example:UPC 0 70993 00595 5 35740
Structure - ISMN is an agency-assigned data element. ISMNs are assigned to music publications by designated agencies in each country participating in the program.
An ISMN consists of ten or thirteen digits. The 10-digit ISMN, used before 2008, is comprised of the letter M followed by 8 digits (variable length publisher number plus item number) plus a single character check digit. The check digit applies to the previous 8 digits.
The 13-digit ISMN, used since 2008, has the prefix 979 and a 0 to replace the M, then 8 digits plus the final check digit. The check digit applies to the previous 12 digits. A 13 digit ISMN is identical to the EAN-13 number encoded in the bar code. The structure is specified in ISO 10957.
An ISMN usually appears on an item preceded by the initialism ISMN and with functional parts separated by a hyphen or space.
Display Constants - Initialism ISMN, the phrase ISMN (invalid), and the embedded hyphens or spaces are not carried in the MARC record. They may be system generated as display constants associated with first indicator value 2 and the content of subfields $a and $z, respectively.
Display example:ISMN M571100511
Display example:ISMN M69200-628-2
Display example:ISMN 979-0-69200-628-2
Structure - EAN has 13 digits. For serials, a three-digit prefix (977) is used in combination with the eight-digit International Standard Serial Number (ISSN) or with a nationally administered title number such as the BIPAD number in North America. A two- or five-digit add-on symbology to designate issues may be present.
For paperback books, a three-digit prefix (978) is followed by the first nine characters of the International Standard Book Number (ISBN), omitting the final ISBN check character. An all-numeric Modulus-10 check digit is the 13th character of the EAN. A five-digit supplement may be used to code additional data, e.g., price.
Display Constants - EAN is carried in the MARC record without the internal hyphens or spaces. Hyphens, spaces, and introductory words may be system generated as display constants associated with first indicator value 3 and the content of subfields $a, $d, and $z.
Display example:EAN 9 780838 934326 90000
Structure - Serial Item and Contribution Identifier (SICI) is a variable length code that provides unique identification of serial issues (SII) and serial contributions (SCI). The SII consists of the ISSN, issue date, issue numbering, SICI standard version number, and a check character. The SCI adds the contribution location and a title code (if more that one title begins on a page) between the issue numbering and the SICI version number. The barcode version of the number on an item will differ from the eye-readable version.
Display Constants - SICI contains punctuation separating the sections of the identifier and they are recorded in the MARC record. Introductory words may be system generated as display constants associated with first indicator value 3 and the content of subfields $a and $z.
Display example:SICI 8756-2324(198603/04)65:2L.4:QTP:1-P
In 1993, the second indicator was given its present definition. Records created prior to this change may contain a code # meaning undefined.
Prior to 1984, this data element was identified by subfield $b; currently subfield $d is used.