600 Subfield $z - Geographic subdivision:

Subfield $z contains a geographic subject subdivision.  Subfield $z is appropriate only when a geographic subject subdivision is added to a name or name/title.

Examples:

600  00  $aFrederick$bII,$cHoly Roman Emperor,$d1194-1250$xHomes and haunts$zItaly.

600  10  $aFord, Gerald R.,$d1913-$xMuseums$zMichigan.