Library of Congress >> MARC >> Authority >> 667-68X  >> 670

670 - Source Data Found (R)

MARC 21 Authority - full
July 2022

First Indicator Second Indicator
# - Undefined

# - Undefined

Subfield Codes
  • $a - Source citation (NR)
  • $b - Information found (NR)
  • $u - Uniform Resource Identifier (R)
  • $w - Bibliographic record control number (R)
  • $6 - Linkage (NR)
  • $7 - Data provenance (R)
  • $8 - Field link and sequence number (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.




$a - Source citation

Citation for a published work or a description of any source or action that provided information about the heading (e.g., a telephone call to a publisher). The citation includes enough information to identify the work, such as the title and imprint date. When a work has a non-distinctive title (e.g., a generic term), the citation may begin with the name of the author. When the author is the same as the 1XX heading, one of the following may be used in the citation: Author's (personal name), or Its (not a personal name). When a 100 heading is used for more than one person (008/32, Undifferentiated personal name, code b), subfield $a may contain a descriptive term for an author enclosed within brackets (e.g., [Author of Ireland]).

110 2#$aOxon Hill Manor (Md.)
670 ##$aPhone call to National Register of Historic Places
110 2#$aWorld Bank
670 ##$aIts Annual report, 1981:$bp.3 (The World Bank is a group of three institutions, the International Bank for Reconstruction and Development (IBRD), the International Development Association (IDA), and the International Finance Corporation (IFC))
100 1#$aSmith, Howard
670 ##$a[Added entry of Inside Japan]
670 ##$aInside Japan, 1981 (a.e.)$bverso t.p. (Howard Smith)
670 ##$a[Author of Ireland]
670 ##$aAuthor's Ireland, 1974:$bt.p. (Howard Smith)
130 #0$aHeadline series
670 ##$aHarsch, Joseph C. Germany at war, 1942: ser. t.p. (Headline books)
[The source cited contains information only concerning a series related to the series being established.]
100 1#$aBreay, Phillis
670 ##$aOCLC, Mar. 1, 2012$b(hdg.: Breay, Phillis)
675 ##$aThe mine explored, 1850
[Name being established was not given in the work cataloged; information found in OCLC WorldCat for the same and/or similar works attributed to Phillis Breay.]

$b - Information found

Parenthetical statement of the information found in the source. A statement of the location of the information within the source, such as cover, t.p., foreword, may also be contained in subfield $b. Multiple occurrences of location/information found within the same source are contained in a single subfield $b.

100 1#$aDefoe, Daniel,$d1661?-1731
670 ##$aInU/Wing STC files$b(usage: a lay-hand in the country)
110 2#$aTwin City Federal
670 ##$aLund, D. A. Billions for homes, c1980 (subj.)$bt.p. (TCF) verso t.p. (Twin City Federal) p. 11 (founded 4-2-23)
110 2#$aBentley Historical Library
670 ##$aBillington, R. A.$bLocal history is ... 1974.
670 ##$aIts Guide to manuscripts in the Bentley Historical Library, 1976:$bt.p. (Bentley Historical Library, Michigan Historical Collections, Univ. of Mich.)
130 #0$aAstronomy library
670 ##$aEicher, D.J. Beyond the solar system, c1992:$bt.p. (Astronomy library)

$u - Uniform Resource Identifier

Uniform Resource Identifier (URI), for example a URL or URN, which provides electronic access data in a standard syntax. This data can be used for automated access to an electronic item using one of the Internet protocols.

100 1#$aKing, Stephen,$d1947-
670 ##$aThe official Stephen King web presence, viewed Oct. 26, 2001:$bThe man (Stephen Edwin King; b. Portland, Maine, 1947)$u

$w - Bibliographic record control number

System control number of the related record preceded by the MARC code, enclosed in parentheses, for the agency to which the control number applies.

150 ##$aDunking (Basketball)
670 ##$aWork cat: Year of the dunk, 2015$w(DLC)2014041716
150 ##$aCabala
670 ##$aBloom, H. Kabbalah and criticism, c1975$w(DLC)75012820$w(OCoLC)1339798
100 1#$aSnyder, G. Irvin
670 ##$aOur soldier boys in khaki o'er in France, ©1918:$bt.p. (G. Irvin Snyder)$w(DLC)2014561136$w(OCoLC)899258216

$6 - Linkage

See description of this subfield in Appendix A: Control Subfields.

$7 - Data provenance

See description of this subfield in Appendix H: Data Provenance Subfields.

$8 - Field link and sequence number

See description of this subfield in Appendix A: Control Subfields.


Punctuation and Spacing - Punctuation and spacing is a matter of judgment. The examples used in the Guidelines area reflect current Library of Congress practice.

Order - First 670 field in a record should contain the citation for the work for which the 1XX heading is being established whenever there is one. Other sources may be listed in any order.


$a - Source consulted and information found [REDEFINED, 1997] [CAN/MARC only]
$u - Uniform Resource Identifier [NEW, 2002]
$w - Bibliographic record control number [NEW, 2015]
$7 - Data provenance [NEW, 2022]

Library of Congress >> MARC >> Authority >> 667-68X  >> 670
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