Required field
Indicates the agency which created the authority record
$a - the LC code for the cataloguing agency.
$b - the 3-letter code for the language of the cataloguing agency (eng).
$f - the six-letter code for the authority heading conventions used:
«unbisn» for Name Authority File*
Examples:
040 $a NNUN $b eng
$f unbisn [Dag Hammarskjöld Library]
040 $a SzGeBNU $b eng
$f unbisn [UNOG Library]
* «unbisn» is currently the default value for this subfield.
A new code «unbiss» (for UNBIS Series Symbol File) may be considered.
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