Library of Congress Control Number

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The Library of Congress Control Number ( LCCN ) is an identifier assigned by the Library of Congress . The LCCN, originally the "Library of Congress Catalog Card Number", is the database identifier (record number) of an entry in the American national bibliography, including the authority data; it is entered in field 010 (and 001) of the MARC files. From 1901 until the introduction of the MARC service, American libraries were able to order catalog cards from the Library of Congress under this number , which is why these numbers can often be found in the imprint of American books (cf. today Cataloging in Publication ).

The system has been in use since 1898. It is independent of the content of a book and should not be confused with the Library of Congress Classification (LCC). The Library of Congress Authorities (LCAuth), a counterpart to the Common Authority File (GND), also use the structure of the LCCN.


LCAuth (screenshot)

In its current form, which was introduced in 2001, the identifier consists of a two-digit alphabetical prefix, which is only used for authority data (persons and keywords), followed by the four-digit year and a six-digit ordinal number. The latter is often shortened for better readability and shown separated by divis .


  • ␣␣␣92022183 (92-22183) Knapp: Elliptic curves (book)
  • ␣␣2002024184 (2002-024184) Marker: Model theory (book)
  • n␣␣50036535 (n50-36535) Guy Davenport (Person)
  • n␣␣94112934 (n94-112934) Barack Obama (Person)
  • no2008168642 (no2008-168642) United States. President (2009-: Obama) (Person)
  • sh␣85092242 (sh85-92242) Noncommutative rings (keyword)

The MARC prefix names the creator of the data record. For persons, “n” stands for the Library of Congress, “nb” for the British Library , “no” for the Online Computer Library Center (OCLC), “nr” for the Research Libraries Information Network (RLIN) and “ns” for the Sky River database .

Until the year 2000, only a two-digit year was used. For the ambiguous years 1998, 1999 and 2000, the appended sequential numbers begin at a specified offset . A special feature applies to numbers that begin with a 7 because of an aborted experiment from 1969 to 1972.

The consecutive numbers within a year consist of six digits with leading zeros. The hyphen inserted into the number is optional and should no longer be used according to the latest guidelines of the Library of Congress.

See also

Web links

Individual evidence

  1. 010 - Library of Congress Control Number (NR) , retrieved March 3, 2016.