First Indicator
Undefined
# - UndefinedSecond Indicator
Undefined
# - Undefined
Subfield Codes
$a - LC control number (NR)
$b - NUCMC control number (R) $z - Canceled/invalid LC control number (R)
$8 - Field link and sequence number (R)
FIELD DEFINITION AND SCOPE
Unique number assigned to a MARC record by the Library of Congress. Valid MARC prefixes for LC control numbers are
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