Not appropriate:
Code b (008/15) indicates that the 1XX field contains a subdivision, reference, or node label heading or an established heading that does not conform to subject heading system/thesaurus conventions. These headings are not appropriate for use as a subject access entry in bibliographic records.
Examples:
008/15 b
008/09 d [subdivision record]
008/11 c [code indicating MeSH]
180 ## $xblood supply
008/15 b
008/09 b [untraced reference record]
150 ## $aBadges of honor
260 ## $isubdivision$aMedals, badges, decorations, etc.$iunder armies, navies, etc., e.g.$aUnited States. Navy--Medals, badges, decorations, etc.
008/15 b
008/09 c [traced reference record]
008/10 c [code indicating AACR 2]
100 1# $aReger, Max,$d1873-1916.$tDies irae
664 ## $aFor this movement included in the composer's unfinished Requiem search under$bReger, Max, 1873-1916.$tRequiem (Mass)
008/15 b
008/09 e [node label record]
008/11 c [code indicating MeSH]
150 ## $acommercial catalogs by function
008/15 b
008/09 a [established heading record]
008/10 c [code indicating AACR 2]
008/39 # [code indicating Library of Congress cataloging]
151 ## $aCeylon
[Although both Ceylon and Sri Lanka are appropriate for use in main or added entries in the Library of Congress authority file, only Sri Lanka is used for subject added entries.]
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