51吃瓜
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650 SUBJECT ADDED ENTRY - TOPICAL TERM - Indicators
 
 
First indicator
Level of index term.
    Blank    No information provided.
    0    No level specified.
    1    Primary.
    2    Secondary.

[UNBIS began implementation of Primary and Secondary headings on 1 April 1999]

Second indicator
Subject heading system/thesarus.
(Values 0-3 and 5-6 are authoritative-agency data elements not used in UNBIS).

UNBIS uses Value=7 only.

    7   Source specified in subfield $2.
    The subject added entry conforms to the subject Heading/thesaurus building conventions identified by the USMARC code contained in subfield $2.


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Last updated: 20 June 2008