To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Library of Congress Control Number

From Wikipedia, the free encyclopedia

The Library of Congress Control Number (LCCN) is a serially based system of numbering cataloging records in the 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 Classification.

YouTube Encyclopedic

  • 1/3
    5 345
  • Registering for Your Reader Identification Card
  • Searching the Library of Congress Subject Authorities Database
  • How to Read Library of Congress Call Numbers


From the Library of Congress in Washington DC. The Library of Congress welcomes people from all over the world to use our reading rooms for research. To gain access to our distinguished collections, you will first need to register for a library of congress reader identification card. This card is free of cost and anyone 16 years of age or older is eligible. You must present a valid reader identification card each time you enter a reading room. If you do not already have a Reader Identification Card, or if your card has expired, please make Reader Registration your first stop at the Library. The Reader Registration station is on the first floor of the James Madison building, one of the three Library of Congress buildings on Capitol Hill. After passing through security, take a left and proceed down the hall. You will find the Reader Registration station in room 140. You will need to present a valid photo ID, such as a driver's license, passport, or state-issued identification that shows your date of birth. Next, your picture will be taken, your signature will be captured, and your new Reader Identification Card will be printed immediately. Your card will be valid for two years and can be renewed at the Reader Registration Station. You can expedite the registration process by pre-registering online. However, you will still need to report in person to the Reader Registration Station for ID verification, and to obtain the physical card. Reader Registration is open Monday through Saturday. Before you visit, you will want to check the website for hours of operation. For questions about the reader registration process, or if you need to register a large group, please contact the Reader Registration office in advance by calling 202-707-5278. Once you have your Reader Identification Card, You can proceed to any of the Library's reading rooms and use the collections. Please note that some reading rooms have special conditions for using their collections. For example, researchers wishing to use the Rare Book Reading Room must be at least 18. For additional guidelines, check our website at And remember, the national library is your library. We hope to see you soon. This has been a presentation of the Library of Congress. Visit us as



The LCCN numbering system has been in use since 1898, at which time the acronym LCCN originally stood for Library of Congress Card Number. It has also been called the Library of Congress Catalog Card Number, among other names. The 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 and third parties make available on the Web and through other media.

In February 2008, the Library of Congress created the LCCN Permalink service, providing a stable URL for all Library of Congress Control Numbers.[1]


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 has instructed publishers not to include a hyphen.

See also


External links

This page was last edited on 30 November 2017, at 18:46.
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.