LC Guidelines: 040 Cataloging Source
NACO:
Do not use subfields: $f, $6, $8
SACO:
Do not use subfields: $e, $f, $6, $8
LC:
NAMES/SERIES:
Do not use subfields: $f, $6, $8
SUBJECTS:
Do not use subfields: $e, $f, $6, $8
LC began using subfield $b in 1998.
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