630 Subject Added Entry - Publication Title

Field definition and scope:

Field 630 contains a publication title used as a subject added entry.

Subject added entries are assigned to a community information record to provide access according to established subject cataloging principles and guidelines. Field 630 may be used by any institution assigning subject headings based on the lists and authority files identified in the second indicator position or in subfield $2 (Source of heading or term).

Field 630 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 630	Subject Added Entry - Publication Title	R
Indicator:
First	Nonfiling characters
0	No nonfiling characters present
1-9	Number of nonfiling characters present

Second	Thesaurus
0	Library of Congress Subject Headings
1	LC subject headings for children's literature
2	Medical Subject Headings
3	National Agricultural Library subject authority file
4	Source not specified
5	Canadian Subject Headings
6	Répertoire de vedettes-matière
7	Source specified in subfield $2

Subfield code:
$a	Title	NR
$f	Date of a work	NR
$n	Number of part/section of a work	R
$p	Name of part/section of a work	R
$s	Version	NR
$v	Form subdivision	R
$x	General subdivision	R
$y	Chronological subdivision	R
$z	Geographic subdivision	R
$0	Authority record control number or standard number	R
$1	Real World Object URI	R
$2	Source of heading or term	NR
$6	Linkage	NR
$8	Field link and sequence number	R

See: Example for this field.

Input conventions:

Content designator history:

Subfield $0 - Authority record control number [new, 2007]

Subfield $0 - Authority record control number [redefined, 2010]

Subfield $1 - Real World Object URI [new, 2017]