Used in an established heading or established heading and subdivision
record to trace a see from
reference from a topical term not used in an established heading.
Subfield Codes
$a - Topical term
entry element (NR). In UNBIS, the complete topical term is entered in $a.
Example:
150 $a OFF ROAD
VEHICLES
494 $a TODOTERRENO
494 $a VEHICULOS DE DOBLE TRACCION
994 $a VEHICULOS TODO TERRENO
Tag 994
is «Heading-Topical Term (Spanish)»
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