650 SUBJECT ADDED ENTRY--TOPICAL TERM (R)
Indicators First Level of subject ^ No information available 0 No level specified 1 Primary 2 Secondary Second Thesaurus 0 Library of Congress Subject Headings 1 LC subject headings for children's literature 2 Medical Subject Headings 3 National Agricultural Library subject authority file 4 Source not specified 5 Canadian Subject Headings 6 Repertoire de vedettes-matiere 7 Source specified in subfield $2
Subfield Codes $a Topical term or geographic name entry element (NR) $b Topical term following geographic name as entry element (NR) $c Location of event (NR) $d Active dates (NR) $e Relator term (NR) $v Form subdivision (R) $x General subdivision (R) $y Chronological subdivision (R) $z Geographic subdivision (R) $2 Source of heading or term (NR) $3 Materials specified (NR) $6 Linkage (NR) $8 Field link and sequence number (R)