044 Subfield $c - ISO subentity code:

Subfield $c contains a subentity code taken from the International Organization for Standardization's Codes for the representation of names of countries and their subdivisions: Part 2, Country subdivision codes, ISO 3166-2.

Example:

008/15-17 sz#

044 ##$cCH-ZH

[Cataloging agency chooses to indicate place of publication as Zürich using the ISO 3166-2 code.]