751 ESTABLISHED HEADING LINKING ENTRY GEOGRAPHIC NAME (R)
Indicators First Undefined; contains a blank (^) Second Thesaurus 0 Library of Congress Subject Headings/LC authority files 1 LC subject headings for children's literature 2 Medical Subject Headings/NLM authority files 3 National Agricultural Library subject authority file 4 Source not specified 5 Canadian Subject Headings/NLC authority file 6 Repertoire des vedettes-matiere/NLC authority file 7 Source specified in subfield $2
Subfield Codes $a Geographic name (NR) $b Name following place as entry element [OBSOLETE] $u Record control number [OBSOLETE] $v Form subdivision (R) $w Control subfield (NR) /0 Link display a Link not displayed b Link not displayed, field 788 used c Link not displayed, non-7XX field used n Not applicable /1 Replacement complexity a Heading replacement does not require review b Heading replacement requires review n Not applicable $x General subdivision (R) $y Chronological subdivision (R) $z Geographic subdivision (R) $0 Record control number $2 Source of heading or term (NR) $5 Institution to which field applies (R) $6 Linkage (NR) $8 Field link and sequence number (R) $3 Authority record control number [OBSOLETE]