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MARC PROPOSAL NO. 2015-09

DATE: June 4, 2015
REVISED:

NAME: Defining 670 $w (Bibliographic record control number) in the MARC 21 Authority Format

SOURCE: Library of Congress, Policy and Standards Division

SUMMARY: This paper proposes the definition of subfield $w (Bibliographic record control number) in the 670 field (Source of Data Found) of authority records to contain a bibliographic record control number of the title being cited.

KEYWORDS: Field 670 (AD); Source Data Found (AD); Subfield $w, in field 670 (AD); Bibliographic record control number (AD)

RELATED:

STATUS/COMMENTS:
06/04/15 – Made available to the MARC community for discussion.

06/28/15 – Results of MARC Advisory Committee discussion: Approved as submitted.

08/06/15 - Results of MARC Steering Group review - Agreed with the MAC decision.

Proposal No. 2015-09: Defining 670 $w (Bibliographic record control number)

1. BACKGROUND

Recording the control number of a related resource within a specific, dedicated, subfield allows for effective data manipulation in linked data applications. Many of the fields added to the MARC Authority Format in recent years include a subfield $w for that purpose (see e.g., 672, Title Related to the Entity; 673, Title Not Related to the Entity; 883, Machine-Generated Metadata Provenance; 856, Electronic Location and Access).

It is Library of Congress practice to include an LCCN (Library of Congress Control Number) of a related bibliographic record in some authority records.  Specifically, LC catalogers include the LCCN of the bibliographic record for the work being cataloged when creating  proposals for LC subject headings and  proposals for LC genre/form and medium of performance terms.  The LCCN is now included in the 670 $a, which is a free-text field for the source citation; thus, the LCCN cannot always be located, identified, and acted upon programmatically.

2. DISCUSSION

The current definition of field 670 is as follows:

• 670 - Source Data Found (R)
• Citation for a consulted source in which information is found related in some manner to the entity represented by the authority record or related entities. May also include the information found in the source.
• 
  Each source citation is contained in a separate 670 field.
  
  Citation for a consulted source that yielded no information is contained in field 675 (Source Data Not Found).
  
  Citations and information in this field are often not written in a form adequate for public user display.
  
  
• • Indicators
    • First - Undefined
    • • # - Undefined, contains a blank
    • Second - Undefined
      • # - Undefined, contains a blank
  • Subfield Codes
    • $a - Source citation (NR)
    • $b - Information found (NR)
    • $u - Uniform Resource Identifier (R)
    • $6 - Linkage (NR)
    • $8 - Field link and sequence number (R)

LC is requesting that a repeatable subfield $w be added as a new subfield to enable an authority record to be linked to the work(s) that prompted the record to be made:

$w - Bibliographic record control number (R)
System control number of the related record preceded by the MARC code, enclosed in parentheses, for the agency to which the control number applies.

3. EXAMPLES

Example 1:

150 ## $a Dunking (Basketball)
670 ## $a Work cat: Year of the dunk, 2015 $w (DLC)  2014041716

Example 2:

150 ## $a Cabala
670 ## $a Bloom, H. Kabbalah and criticism, c1975 $w (DLC) 75012820 $w (OCoLC)1339798

Example 3:

151 ## $a MIKTA countries
670 ## $a Work cat: MIKTA, middle powers, and new dynamics of global governance, 2015: $b page 1 (the middle powers among the G20 - Mexico, Indonesia, South Korea, Turkey, and Australia (MIKTA)) $w (OCoLC)904972699

Example 4:

150 ## $a Grumman Mallard (Amphibian plane)
670 ## $a Work cat: Knight, F.J. The Grumman amphibians: Goose, Widgeon & Mallard, 2013. $w (Uk) 016706312

Example 5:

100 1# $a Snyder, G. Irvin
670 ## $a Our soldier boys in khaki o'er in France, ©1918: $b t.p. (G. Irvin Snyder)  $w (DLC)  2014561136 $w (OCoLC)899258216

4. BIBFRAME DISCUSSION

The inclusion of the bibliographic control number in addition to or in lieu of the citation will be very useful for eventual conversion of the bibliographic description to BIBFRAME.

5. PROPOSED CHANGES

In Field 670 (Source Data Found) of the MARC 21 Authority Format, define:

$w - Bibliographic record control number (R)
System control number of the related record preceded by the MARC code, enclosed in parentheses, for the agency to which the control number applies.

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