Difference between revisions of "Help:How to create a link to a US Library of Congress (Loc) record"

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Most books published in the US have an assigned LCCN -- the ''Library of Congress Control Number'' (formerly ''Catalog Number''). This is generally worth recording in the notes of the relevant publication.  
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Many<sup>[1]</sup> books published in the US have an assigned [https://en.wikipedia.org/wiki/Library_of_Congress_Control_Number Library of Congress Control Number]<sup>[2]</sup> (LCCN). Publishers will often include this number on the copyright page. This number should be recorded (with a couple of exceptions listed below) in the [[Template:PublicationFields:ExternalIDs|external links]] section of the publication record (select LCCN as the type).
  
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For books published before 2001, the number is generally shown as a two-digit year, a hyphen, and a serial number of up to 6 digits. (There was a brief period in 1970-72 when the two digits did not show the year.)
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A LoC catalog record is typically specific to an edition. In general, the LCCN should only be added to the external links of the matching edition. Sometimes publishers will include the same LCCN in a later edition. In that case, it should be noted in the publication notes, along with the statement of what edition it is for, rather than in the external links.
  
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For books after 2001-01-01, the year is given as 4 digits, and the hyphen is usually omitted.  
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A LoC catalog record may list the ebook as an alternate format. In that case, the LCCN should be entered in the external links of the ebook version as well.
  
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A permanent link to the online LoC record for a given LCCN is formed as follows: "<code>LCCN: <nowiki><a HREF="http://lccn.loc.gov/12345678">YY-NNNNN</a></nowiki></code>" or "<code>LCCN: <nowiki><a HREF="http://lccn.loc.gov/12345678">YYYYNNNNNN</a></nowiki></code>". The number in the URL should start with the 2 or 4-digit year, omit the hyphen, and pad the remaining number to 6 digits with leading zeros, if needed. Thus 45-7832 gives the URL <code><nowiki>http://lccn.loc.gov/45007832</nowiki></code>, 76-89432 gives <code><nowiki>http://lccn.loc.gov/76089432</nowiki></code>, and 2007683290 gives <code><nowiki>http://lccn.loc.gov/2007683290</nowiki></code> for a URL.  
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Is not unusual for a book to contain an invalid LCCN (one that does not resolve to a LoC catalog record). In that case, it should be noted in the publication notes, along with the explanation that it is invalid, rather than in the external links. If the correct number can be found, it should be placed in the external links.
  
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See [http://lccn.loc.gov/lccnperm-faq.html the LoC's LCCN permalink FAQ] for more detail.
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Footnotes:
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#The LoC does not catalog self-published and on-demand printed books.
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#Originally known as a "Library of Congress Card Number" and later a "Library of Congress Catalog Card Number".

Revision as of 10:50, 2 December 2018

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Many[1] books published in the US have an assigned Library of Congress Control Number[2] (LCCN). Publishers will often include this number on the copyright page. This number should be recorded (with a couple of exceptions listed below) in the external links section of the publication record (select LCCN as the type).

A LoC catalog record is typically specific to an edition. In general, the LCCN should only be added to the external links of the matching edition. Sometimes publishers will include the same LCCN in a later edition. In that case, it should be noted in the publication notes, along with the statement of what edition it is for, rather than in the external links.

A LoC catalog record may list the ebook as an alternate format. In that case, the LCCN should be entered in the external links of the ebook version as well.

Is not unusual for a book to contain an invalid LCCN (one that does not resolve to a LoC catalog record). In that case, it should be noted in the publication notes, along with the explanation that it is invalid, rather than in the external links. If the correct number can be found, it should be placed in the external links.

Footnotes:

  1. The LoC does not catalog self-published and on-demand printed books.
  2. Originally known as a "Library of Congress Card Number" and later a "Library of Congress Catalog Card Number".
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