| First Indicator National bibliographic agency # - Library and Archives Canada 7 - Source specified in subfield $2 |
Second Indicator Undefined # - Undefined |
| Subfield Codes |
|
| $a - Record control number (NR) $z - Canceled/invalid control number (R) |
$2 - Source (NR) $8 - Field link and sequence number (R) |
Unique numbers that have been assigned to a record by a national bibliographic agency other than the Library of Congress. The control number may also appear in field 001 (Control Number) in records distributed by the same national agency. This number is a record control number used in a national bibliographic agency system, rather than a number used for an entry in a national bibliography, field 015 (National Bibliography Number).
Library of Congress control numbers are recorded in field 010. An organization using the record may remove the national bibliographic agency control number from field 001 and use field 001 for its own system control number.
Record may contain field 016 with a canceled or invalid control number of a previously-distributed record. A record may be canceled because it is a duplicate record for the same item.
| 016 | ##$a#730032015##rev | ||||||||
| 016 | ##$a#84074272XE# | ||||||||
| 016 | 7#$a94.763966.7$2GyFmDB [Record control number is for the Deutsche Bibliothek.] |
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| 016 | ##$a#721234569## | ||||||||
| 016 | 7#$aPTBN000004618$2PoLiBN [Record control number is for the Biblioteca Nacional, Portugal.] |
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| 016 | ##$a#890000298##rev$z#89000298## | ||||||||
| 016 | 7#$ab9117951$zE000214460$2Uk [Code "Uk" identifies the British Library as the source of the control numbers] |
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With the redefinition of field 016 in 1997, any national bibliographic agency can record its control numbers in this field. Although the structure of numbers would vary from agency to agency, extensive use of field 016 has been made by Library and Archives Canada. Their control number structure is given below.
The language code (character position 10) identifies, with a code “E” (English) or “F” (French), a bilingual item for which two separate bibliographic records, one in English, the other in French, are produced.
In January 2001, a structural change occurred to accommodate a four digit year.
Pre-Year 2001 Control Number Structure
| Name of Element | Number of characters | Character position in field |
| Undefined | 1 | 00 |
| Year | 2 | 01-02 |
| Serial number | 6 | 03-08 |
| Check digit | 1 | 09 |
| Language code | 1 | 10 |
| Undefined | 1 | 11 |
| Revision indicator | variable | 12-n |
Control Number Structure for 2001 and Beyond
| Name of Element | Number of characters | Character position in field |
| Year | 4 | 00-03 |
| Serial number | 6 | 04-09 |
| Check digit | 1 | 10 |
| Language code | 1 | 11 |
| Revision indicator | variable | 12-n |
| (03/18/2008) | Contact Us |