"लाइब्रेरी ऑफ कॉंग्रेस नियंत्रण संख्या" के अवतरणों में अंतर

(added external link ''Examples of Library of Congress Control Numbers (LCCN) from Penn State University Libraries'')
[[Librarian]]s 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.<ref>{{cite web |title=Library of Congress Update for 2008 ALA Annual Conference: January–May, 2008 |url= http://www.loc.gov/ala/an-2008-update.html |accessdateaccess date=2008-09-29}}</ref>
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