https://www.wikidata.org/wiki/Property:P1144
Library of Congress item ID (LCCN bibliographic) - Wikidata
record number for entries in the LC bibliographic catalog/OPAC (for authority records use P244)
library of congressitemidlccn
https://lccn.loc.gov/
Frequently Asked Questions - LCCN Permalink
Frequently Asked Questions: LCCN Permalink
frequently asked questionslccnpermalink