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The Library of Congress
Library of Congress
Control Number (LCCN) is a serially based system of numbering cataloging records in the Library of Congress
Library of Congress
in the United States. It has nothing to do with the contents of any book, and should not be confused with Library of Congress
Library of Congress
Classification.

Contents

1 History 2 Format 3 See also 4 References 5 External links

History[edit] The LCCN numbering system has been in use since 1898, at which time the acronym LCCN originally stood for Library of Congress
Library of Congress
Card Number. It has also been called the Library of Congress
Library of Congress
Catalog Card Number, among other names. The Library of Congress
Library of Congress
prepared cards of bibliographic information for their library catalog and would sell duplicate sets of the cards to other libraries for use in their catalogs. This is known as centralized cataloging. Each set of cards was given a serial number to help identify it. Although most of the bibliographic information is now electronically created, stored, and shared with other libraries, there is still a need to identify each unique record, and the LCCN continues to perform that function. Librarians all over the world use this unique identifier in the process of cataloging most books which have been published in the United States. It helps them reach the correct cataloging data (known as a cataloging record), which the Library of Congress
Library of Congress
and third parties make available on the Web and through other media. In February 2008, the Library of Congress
Library of Congress
created the LCCN Permalink service, providing a stable URL for all Library of Congress
Library of Congress
Control Numbers.[1] Format[edit] In its most elementary form the number includes a year and a serial number. The year has two digits for 1898 to 2000, and four digits beginning in 2001. The three ambiguous years (1898, 1899, and 1900) are distinguished by the size of the serial number. There are also some peculiarities in numbers beginning with a "7" because of an unsuccessful experiment applied between 1969 and 1972. Serial numbers are six digits long and should include leading zeros. The leading zeros padding the number are a more recent addition to the format, so many older works will show less full codes. The hyphen that is often seen separating the year and serial number is optional. More recently, the Library of Congress
Library of Congress
has instructed publishers not to include a hyphen. See also[edit]

Library of Congress
Library of Congress
Subject Headings (LCSH) Authority control Virtual International Authority File
Virtual International Authority File
(VIAF) CODEN Integrated Authority File
Integrated Authority File
(GND; Gemeinsame Normdatei) International Standard Book Number
International Standard Book Number
(ISBN) Books in the United States

References[edit]

^ " Library of Congress
Library of Congress
Update for 2008 ALA Annual Conference: January-May, 2008". Archived from the original on 2017-08-28. 

External links[edit]

Wikidata
Wikidata
has the property: LCOC LCCN (bibliographic) (P1144) (see talk; uses)

Wikidata
Wikidata
has the property: Library of Congress
Library of Congress
authority ID (P244) (see talk; uses)

Library of Congress
Library of Congress
Name Authority File
File
(NAF) Structure of the LC Control Number Traditional and normalized forms of the LCCN LCCN Permalink Frequently Asked Questions Bibliographic Processing Cataloging Rules: Library of Congress
Library of Congress
Control Number (LCCN) at the Wayback Machine
Wayback Machine
(archived 2016-05-13)

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Library of Congress
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