13.2 Authority Record Identifier (Required)
13.2.1 Record a unique identifier for the authority record. The number may be assigned locally or be based upon an identifier from a regional or national database such as the Library of Congress Authorities.
ARC-ID-976172 (unique identifier assigned by the National Archives and Records Administration to an archival authority record)
02-79026910 (unique identifier based upon the Library of Congress Control Number )
beinecke.j0zpcks (locally assigned identifier)