448 SEE FROM TRACING -- CHRONOLOGICAL TERM (R)
Indicators Both undefined; each contains a blank (^)
Subfield Codes $a Chronological term (NR) $i Reference instruction phrase (R) $v Form subdivision (R) $w Control subfield (NR) /0 Special relationship a Earlier heading b Later heading d Acronym f Musical composition g Broader term h Narrower term i Reference instruction phrase in subfield $i n Not applicable t Immediate parent body | fill character /1 Tracing use restriction a Name reference structure only b Subject reference structure only c Series reference structure only d Name and subject reference structures e Name and series reference structures f Subject and series reference structures g Name, subject, and series reference structures n Not applicable | fill character /2 Earlier form of heading a Pre-AACR 2 form of heading (national name authority file) e Earlier established form of heading (national authority file) o Earlier established form of heading (other authority file) n Not applicable | fill character /3 Reference display a Reference not displayed b Reference not displayed, field 664 used c Reference not displayed, field 663 used d Reference not displayed, field 665 used n Not applicable $x General subdivision (R) $y Chronological subdivision (R) $z Geographic subdivision (R) $5 Institution to which field applies (R) $6 Linkage (NR) $8 Field link and sequence number (R)