If the first indicator position contains value #, the code contains an alphanumeric cutter which is derived from the Library of Congress--Class G or the expanded Cutter number lists for place names.052 Subfield $b - Geographic classification subarea code:
Subfield $b contains a geographic subarea code related to the geographic area coded in subfield $a.
If the first indicator position contains value #, the code contains an alphanumeric cutter which is derived from the Library of Congress--Class G or the expanded Cutter number lists for place names.
The subfield may also contain a geopolitical subarea code from FIPS 10-4, or another code list as specified in subfield $2.
Each geographic subarea code is contained in a separate subfield $b. Subfield $b may be repeated for subareas falling within a main area with the same code.
Examples:
151 ## $aRichmond (Tex.)$xMaps
052 ## $a4034$bR4$bR8
181 ## $zTexas$zRichmond
052 ## $a4034$bR4$bR8