630 - Subject Added Entry-Uniform Title (R)

$a - Uniform title (NR)

$d - Date of treaty signing (R)

$e - Relator term (R)

$f - Date of a work (NR)

$g - Miscellaneous information (R)

$h - Medium (NR)

Media qualifier.

$k - Form subheading (R)

$l - Language of a work (NR)

$m - Medium of performance for music (R)

$n - Number of part/section of a work (R)

$o - Arranged statement for music (NR)

$p - Name of part/section of a work (R)

$r - Key for music (NR)

$s - Version (R)

$t - Title of a work (NR)

Title-page title of an item.

$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)

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.

$8 - Field link and sequence number (R)

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

See the descriptions of subfields $f, $g, $l, $n, and $p under field 100.