052 GEOGRAPHIC CLASSIFICATION (R)Indicators First Code source ^ Library of Congress Classification 1 U.S. Dept. of Defense Classification 7 Source specified in subfield $2 Second undefined; contains a blank (^)Subfield Codes $a Geographic classification area code (NR) $b Geographic classification subarea code (R) $d Populated place name (R) $2 Code source (NR) $6 Linkage (NR) $8 Field link and sequence number (R)