Library of Congress Control Number


August 13, 2022

The Library of Congress Control Number (LCCN in Czech) is an identifier used by the Library of Congress in Washington since 1898. This system is not focused purely on the content of the work and therefore cannot be confused with the Library of Congress Classification. This is a database identifier (record number) in the American National Bibliography in the MARC standard. From 1901 until the introduction of the MARC system, American libraries could order LCCN cataloging cards from the Library of Congress, which is why these numbers are often found on US book stamps.


The identifier consists of a one- to two-digit letter prefix that is used only for some standard data, a year and a six-digit serial number. Until 2000, only the last two digits were used for the year. Due to ambiguity since 1998 and in the following period (the system has been in use since 1898), a modified recording method has been switched. Since 2001, the two-digit letter prefix is ​​followed by the entire four-digit year and six-digit serial number, which is shortened by leading zeros and separated by a hyphen for easier readability. However, when searching by LCCN in the online catalog, it is necessary to remove the hyphen and fill in the missing zeros. The exception is the six-digit numbers beginning with the number 7, which were assigned during an aborted experiment in 1969–1972. Examples of identifiers: ␣␣␣92022183␣ (92-22183) Knapp Anthony: Elliptic curves (book) ␣␣2002024184 (2002-24184) Marker David: Model theory (book) n␣␣50036535␣ (n50-36535) Guy Davenport (person) no2008168642 (no2008-168642) United States. President (2009-: Obama) (person) sh␣85092242␣ (sh85-92242) Noncommutative rings (password)


This article uses a translation of the text from the Library of Congress Control Number article on the German Wikipedia.

External links

(English) Identifier structure