648 - Subject Added Entry-Chronological Term (R)

$a - Chronological term (NR)

$e - Relator term (R)

$v - Form subdivision (R)

$x - General subdivision (R)

$y - Chronological subdivision (R)

$z - Geographic subdivision (R)

$0 - Authority record control number or standard number (R)

See description of this subfield in Appendix A: Control Subfields.

$1 - Real World Object URI (R)

See description of this subfield in Appendix A: Control Subfields.

$2 - Source of heading or term (NR)

MARC code that identifies the source list from which the subject added entry was assigned. It is used only when the second indicator position contains value 7 (Source specified in subfield $2). Code from: Subject Heading and Term Source Codes.

$3 - Materials specified (NR)

$4 - Relationship (R)

$6 - Linkage (NR)

See description of this subfield in Appendix A: Control Subfields.

$7 - Data provenance (R)

See description of this subfield in Appendix J: Data Provenance Subfields.

$8 - Field link and sequence number (R)

See description of this subfield in Appendix A: Control Subfields.