Geographic area codes (GAC) for geographic areas associated with the community information entity. Codes from: MARC Code List for Geographic Areas. The source of a local code in subfield $b is indicated in subfield $2. The source of codes in subfield $c is ISO 3166, Codes for the representation of names of countries and their subdivisions - Part 1: Country codes or Part 2: Country subdivision codes. Information in textual form about the geographic area served may be contained in field 522 (Geographic Area Note).