LC Guidelines: 667 Nonpublic General Note
NACO:
Do not use subfields: $5, $6, $8
SACO:
Do not use subfields: $5, $6, $8
LC:
NAMES/SERIES:
Do not use subfields: $5, $6, $8
SUBJECTS:
Do not use subfields: $5, $6, $8
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