852 $a - Location:

Subfield $a identifies the institution or person holding the item or from which access is given. The field contains a USMARC code of the holding institution or the name of the institution or person. The source of the USMARC code is Symbols of American Libraries that is maintained by the Library of Congress. A sublocation within an organization is contain in subfield $b (Sublocation or collection). To assist in differentiating between a subfield $a institutional location and a subfield $b sublocation, subfield $a contains the name to be addressed in external communications and subfield $b contains the name within the institution.

If the bibliographic item is owned by an individual or organization other than the one identified in subfield $a, the actual owner may be identified in subfield $x (Nonpublic note) or $z (Public note) or in field 561 (Provenance Note). If the item is physically located somewhere other than the location from which it is available, the physical location may also be identified in subfield $x or $z of field 852. Example: