Fields 760-787 originally were defined only in the serials specifications and contained information describing relationships between bibliographic items that did not necessarily facilitate indexing or provide a machine link to the record for the related item.

In 1977, subfield $w (Record control number) was defined in these fields to facilitate linkage among records within a given system and across systems.

In 1981, the following fields were validated for the books specifications and subfield $r (Report number) was defined to permit linkage through report numbers of technical report materials:  765, 767, 770, 772, 775, 776, 780, 785, and 787.

When the record-linking technique was fully developed in 1982, field 773 (Host Item Entry) was defined for all MARC specifications to accommodate the cataloging of component parts.  The definitions of several other subfields were either broadened or more narrowly defined at that time.

Field 786 - Data Source Entry  [new, 1995]

Field 787 - Nonspecific Relationship Entry  [renamed, 2009]:  Renamed Other Relationship Entry.

Subfields  $c - Qualifying information  (SE)  [redefined]

$d - Dates of publication  (SE)  [obsolete]

Prior to 1976, subfield $c was defined as Place of publication.  In 1976, when subfield $c was redefined as $c (Qualifying information), subfield $d was made obsolete.

Subfield $g - Relationship information  [broadened]:  Prior to 1982, subfield $g was defined as Relationship dates and contained only the dates during which the relationship existed, where applicable.  It was broadened in 1982 as part of the record-linking specifications, specifically to include the location information of a component part in a host item.

Subfield $g - Relationship information  [renamed, 2009]:  Renamed to Related parts.

Subfield $i - Display text  [redefined, 2009]:  Renamed to Relationship information and changed from Not repeatable (NR) to Repeatable (R).

Subfields    $b - Edition  [new]

$d - Place, publisher, and date of publication  [new]

$k - Series data for related item  [defined]

$s - Uniform title  [defined]

$7 - Control subfield  [defined]

The current subfield $d (Place, publisher, and date of publication), as well as subfields $b, $k, $s, and $7, were defined in 1982 as part of the record-linking specifications.  Prior to 1982, edition statements and publication statements were recorded in subfield $c, and uniform titles were recorded in subfield $t.

Subfield $q - Parallel title  [all except 773]  [obsolete]:  In 1990, subfield $q was made obsolete.

Subfield $q - Enumeration and first page  [773 only]  [new, 2003]

Subfield $4 - Relationship code  [new, 2009]

Subfield $4 - Relationship code  [renamed, 2017] [redescribed, 2017]:  Subfield $4 was renamed to Relationship and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.

Subfield $7/2 - Type of record

code b - Archival and manuscripts control  [obsolete]:  Use of the Type of record code b (Archival and manuscripts control) was made obsolete in 1995 with the definition of codes p (Mixed material) and t (Manuscript language material).

Subfield $7/1 - Form of name

code 2 - Multiple surname  [obsolete]:  Use of the Form of name code 2 (Multiple surname) was made obsolete in 1996 when code 1 (Single surname) was redefined as surname to be used for headings with either single or multiple surnames.

Subfield $7/3 - Bibliographic level from Leader/07 of related record

code p - Pamphlet  [obsolete]  [CAN/MARC only]

See also:

76X-79X  Linking Entry Fields - General Information

76X-79X  Linking Entry Fields

Variable Data Fields

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