LC Guidelines: 001 Control Number
NACO:
Structure: Control numbers used in name/series authority records contributed through NACO have two character alphabetic prefixes (records originally contributed 2001+) or three character alphabetic prefixes (records originally contributed prior to 2001). The prefix is carried as lowercase characters; it is left justified and unused positions contain blanks. The valid control number prefixes for name and series authority records are (# = blank):
n## |
Name and series authority records originally input prior to 2001 using LC's internal system |
n# |
Name and series authority records originally input 2001+ using LC's internal system |
nb# |
Name and series authority records originally contributed prior to 2001 via the British Library |
nb |
Name and series authority records originally contributed 2001+ via the British Library |
no# |
Name and series authority records originally contributed prior to 2001 via OCLC |
no |
Name and series authority records originally contributed 2001+ via OCLC |
nr# |
Name and series authority records originally contributed prior 2001 via RLIN |
nr |
Name and series authority records originally contributed 2001-2007 via RLIN |
ns |
Name and series authority records originally contributed 2010+ via SkyRiver |
SACO:
Subject authority records are not normally contributed in machine-readable form from sources outside the Library of Congress.
LC:
NAMES/SERIES:
Library of Congress and NACO control numbers have the same structure. See NACO section above.
Control numbers for name/series authority records created using LC's internal system have the following alphabetic prefix:
n## |
Name and series authority records originally input prior to 2001 |
n# |
Name and series authority records originally input 2001+ |
Name/series authority records created by LC catalogers using OCLC or RLIN have control numbers beginning with the prefixes “no” or “nr” as above.
SUBJECTS:
Control numbers for subject authority records created using LC’s internal system have the following alphabetic prefixes:
sh# |
Subject heading authority record originally input prior to 2001 |
sh |
Subject heading authority record originally input 2001+ |
sp# |
Subject (Proposed) authority record originally input prior to 2001 |
sp |
Subject (Proposed) authority record input 2001+ |
sj# |
Subject (Juvenile) authority record originally input prior to 2001 |
sj |
Subject (Juvenile) authority record input 2001+ |
For more information on LC Guidelines, select:
To return: