Appropriate:

Code a (008/15) indicates that the 1XX field contains an established heading name, name/title, uniform title, topical term, or extended subject heading that conforms to subject heading system/thesaurus conventions.  These headings are appropriate for use as a subject access entry in bibliographic records.

Examples:

008/15   a

008/11   a  [code indicating LCSH]

150  ##  $aSuper Bowl Game (Football)

008/15   a

008/11   a  [code indicating LCSH]

150  ##  $aBeds in literature

008/15   a

008/11   a  [code indicating LCSH]

151  ##  $aLoire River Valley (France)

008/15   a

008/10   c  [code indicating AACR 2]

008/11   a  [code indicating LCSH]

100  1#  $aShai, Mordekhai

008/15   a

008/11   a  [code indicating LCSH]

151  ##  $aChina$xHistory$yMay Thirtieth Movement, 1925