015 National Bibliography Number

Field definition and scope:

Field 015 contains one or more bibliography entry numbers for cataloging information that is derived from a national bibliography.

When cataloging information is derived from an entry in a foreign national bibliography, the number of the entry is given in the record. A work may have more than one number from a single national bibliography or may have numbers from more than one national bibliography. Multiple numbers are recorded in repeating 015 fields.

The National level record requirement for this field is Optional.

Field 015 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 015	National Bibliography Number	O	O	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	National bibliography number	M	O	R
$q	Qualifying information			R
$z	Canceled or invalid national bibliography number	A	O	R
$2	Source			NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Content designator history:

In 2001, field 015 was changed from Not repeatable (NR) to Repeatable (R) to allow for multiple bibliography numbers.

Subfield $q - Qualifying information [new, 2013]: Prior to the definition of subfield $q in 2013, qualifying information was contained in subfield $a (National bibliography number).

Subfield $z - Canceled or invalid national bibliography number [new, 2007]

Subfield $2 - Source [new, 2001]: Subfield $2 was defined to contain the source of the National Bibliography Number.