020 - International Standard Book Number (R)
MARC 21 Bibliographic - Full
October 2005
First Indicator Undefined # - Undefined
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Second Indicator Undefined # - Undefined
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Subfield Codes
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$a - International Standard Book Number (NR) $c - Terms of availability (NR) $z - Canceled/invalid ISBN (R)
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$6 - Linkage (NR) $8 - Field link and sequence number (R)
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FIELD DEFINITION AND SCOPE
International Standard Book Number (ISBN) assigned to a monographic publication by
designated agencies in each country participating in the program. The field may include
terms of availability and canceled or invalid ISBNs, such as ISBNs with invalid check
digits or that are not applicable to the item being cataloged. It may be repeated for
multiple numbers associated with the item (e.g., ISBNs for the hard bound and paperback
manifestations; ISBNs for a set as a whole and for the individual parts in the set).
Each field contains all the information relevant to one ISBN, or if no ISBN exists,
relevant to the item being cataloged.
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
■ INDICATORS
- Both indicator positions are undefined; each contains a blank (#).
■ SUBFIELD CODES
$a - International Standard Book Number Valid ISBN and any parenthetical qualifying information, such as the
publisher/distributor, binding/format, and volume numbers. ISBN and the
embedded hyphens may be generated for display.
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##$a9780060723804 (acid-free paper)
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##$a9780060799748 (trade)
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##$a0717941728 (folded) :$c$0.45
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##$a0914378260 (pbk. : v. 1) :$c$5.00
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##$a0394502884 (Random House) :$c$12.50
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##$a0394170660 (Random House : pbk.) :$c$4.95 [Two ISBN's associated with one catalog record.] |
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##$a0877790086 :$c$10.00
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##$z0877790105 (Fabrikoid) :$c$12.00
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##$a0877790019 (black leather)$z0877780116 :$c$14.00
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##$a0877790124 (blue pigskin) :$c$15.00
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##$z0877790159 (easel binding) :$c$16.00 [Five numbers associated with one catalog record. Two are valid; one has
both a valid and invalid form; two are invalid.] |
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##$a0456789012 (reel 1)
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##$z0567890123 (reel 2) [Two numbers associated with one catalog record.] |
$c - Terms of availability Price or a brief statement of availability and any parenthetical qualifying
information concerning the item.
If only price information is present, data relevant to a single item is given in
one subfield $c in one field 020 and data relevant to another item is given in
another subfield $c in a subsequent 020 field.
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##$a0802142176 (pbk.) :$c$1.95
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##$c$8.95
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##$cRs15.76 ($5.60 U.S.)
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##$cFor sale ($450.00) or rent ($45.00)
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##$cFor sale ($200.00 for 3/4 in.; $150.00 for 1/2
in.)
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##$c$4.95 (lib. bdg.)
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##$c$3.60 (pbk.) [Two prices for two items on one catalog record; no ISBNs are known.] |
$z - Canceled/invalid ISBN Canceled or invalid ISBN and any parenthetical qualifying information. ISBN
(invalid) and the embedded hyphens may be generated for display.
Each canceled/invalid ISBN is contained in a separate subfield $z. If no valid
ISBN exists, subfield $z may be used alone in the record.
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##$z0835200028 :$c$10.00
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##$a0835200019 (pbk.) :$c$2.95 [Two ISBN's associated with one catalog record, one of which is
invalid.] |
$8 - Field link and sequence number
INPUT CONVENTIONS
ISBN Structure - ISBN is an agency-assigned data element. ISBNs are assigned to monographic publications
by designated agencies in each country participating in the program. An ISBN consists of
ten or thirteen digits. The 10-digit ISBN comprises four groups separated by hyphens.
(The tenth digit is a check digit used as a computer validity check; it consists of a
number between 0 and 9 or an uppercase X (for the arabic numeral 10). The 13-digit ISBN
comprises of five elements. Element one consists of a 3-digit EAN prefix that identifies
the book industry. Element two identifies the country or language agency. Element three
identifies the publisher prefix. Element four identifies the title or specific edition
of a publication. Element five contains a check digit.Procedures for validation of the ISBN by calculating the check digit and hyphenating
instructions are in Information and Documentation - International Standard Book
Numbering (ISBN) (ISO 2108). A description of the ISBN structure and guidelines
for recording qualifying information are found in Library of Congress Rule
Interpretations available from the Cataloging Distribution Service, Library of
Congress.
ISBN is an agency-assigned data element. ISBNs are assigned to monographic publications
by designated agencies in each country participating in the program. An ISBN consists of
ten or thirteen digits. The 10-digit ISBN comprises four groups separated by hyphens.
(The tenth digit is a check digit used as a computer validity check; it consists of a
number between 0 and 9 or an uppercase X (for the arabic numeral 10). The 13-digit ISBN
comprises of five elements. Element one consists of a 3-digit EAN prefix that identifies
the book industry. Element two identifies the country or language agency. Element three
identifies the publisher prefix. Element four identifies the title or specific edition
of a publication. Element five contains a check digit.Procedures for validation of the ISBN by calculating the check digit and hyphenating
instructions are in Information and Documentation - International Standard Book
Numbering (ISBN) (ISO 2108). A description of the ISBN structure and guidelines
for recording qualifying information are found in Library of Congress Rule
Interpretations available from the Cataloging Distribution Service, Library of
Congress.
Classes of ISBNs - ISBNs may be valid for the item being cataloged, or canceled, structurally invalid, or
application invalid. The following conventions may be followed to select the appropriate
subfield for an ISBN.
Valid ISBN: - Valid ISBN is one in which the length, structure, and check digit are correct, and the
ISBN is applicable to the item being cataloged. The validity of an ISBN to a particular
bibliographic item is usually related to the treatment given it by the cataloging agency
in terms of the number of records involved. If a single record represents more than one
manifestation, e.g., hard back and paperback, both ISBNs are valid. If a single record
represents a multipart monograph, ISBNs for the set as a whole and those for individual
volumes are valid. If a single record describes the main part and supplemental parts of
a bibliographic item, all ISBNs for the main and the supplemental material are valid. In
cases of multiple valid ISBNs in one record, appropriate qualifiers to differentiate the
ISBNs are usually included. Note that during the transition from a 10-digit ISBN to a
13-digit one (2005-2007), some bibliographic agencies include both a 13-digit number and
a 10-digit one for the same item in repeated 020 fields. In such cases, parenthetical
qualification is not used to differentiate between the 10-digit and 13-digit ISBNs.
Canceled ISBN: - ISBN is considered to be canceled when a publisher designates it as such.
Structurally invalid ISBN: - ISBN is considered to be structurally invalid when its length or structure is incorrect
or its check digit does not agree with the formula for calculating it.
Application invalid ISBN: - ISBN is considered to be application invalid for a particular record when it appears on
the bibliographic item, but it is known, through research or other means, that the same
number is also assigned to a different resource.ISBN may also be considered to be application invalid if it is not directly applicable
to the bibliographic item represented by a particular record. Application invalidity is
usually related to the cataloging treatment employed by a particular agency in terms of
the number of records involved. For example, if there is a record for a multivolume set
as well as separate records for each of the volumes in the set, the ISBN for the set is
considered application invalid on the records for the volumes. Only the ISBN applicable
to the entity represented by a particular record is considered valid on that record.
ISBN is considered to be application invalid for a particular record when it appears on
the bibliographic item, but it is known, through research or other means, that the same
number is also assigned to a different resource.ISBN may also be considered to be application invalid if it is not directly applicable
to the bibliographic item represented by a particular record. Application invalidity is
usually related to the cataloging treatment employed by a particular agency in terms of
the number of records involved. For example, if there is a record for a multivolume set
as well as separate records for each of the volumes in the set, the ISBN for the set is
considered application invalid on the records for the volumes. Only the ISBN applicable
to the entity represented by a particular record is considered valid on that record.
Punctuation - Field 020 does not end with a period.
Display Constants
ISBN |
[associated with the content of subfield $a] |
ISBN (invalid) |
[associated with the content of subfield $z] |
- - - |
[embedded hyphens] |
ISBN usually appears on an item with the prefix
ISBN and with each of its parts
separated from the other by hyphens or spaces. The initialism
ISBN, the phrase
ISBN (invalid), and the embedded hyphens are not carried in the MARC record.
They may be system generated as display constants associated with the content of
subfields $a and $z, respectively.
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Content designated field:
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##$a0870686933 (v. 1)$z087064302
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Display example:
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ISBN 0-87068-693-3 (v. 1) ISBN (invalid)
0-87068-430-2
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CONTENT DESIGNATOR HISTORY
Prior to 1977, field 020 was not repeatable and multiple ISBNs and related information
were contained in repeatable subfields $a, $b, and $c.
$b - Binding information (BK, MP, MU) [OBSOLETE]
Prior to 1978, binding information was separately subfield coded. In 1978, binding
information became a parenthetical qualifier of the ISBN and subfield $b was made
obsolete.
$c - Terms of availability
Prior to the definition of subfield $c in 1974, bibliographic price information was
contained in field 350 (Price).