The locations in the MARC Code List for Geographic Areas (GAC) are the basis of the locations in the Geographic Strengths and Geographic Locations Served parts of the profile. However, some locations are not useful for Geographic Locations Served because they refer to geographic areas that no longer exist, for example, Germany (East). Additional information about the GAC is available on the GAC web site at http://lcweb.loc.gov/marc/geoareas/.
The locations in the Geographic Strengths and Geographic Locations Served parts of the profile are organized in levels as the locations in the GAC are organized. The GAC web site includes the following description of GAC levels:
"The codes are constructed to provide a hierarchical arrangement of geographic and political entities. There are three levels possible in the codes. Most codes are at the first level and represent continents, regions, geographic features, and some national level political jurisdictions... Second level codes represent regions and national level political entities located within the entity represented by the first level code... Third level codes represent first order political divisions of countries represented by a second level code."