Indicators
First Undefined; contains a blank (^)
Second Nonfiling characters
0-9 Number of nonfiling characters present
^ Nonfiling characters not specified [OBSOLETE]
Subfield Codes
$a Uniform title (NR)
$d Date of treaty signing (R)
$f Date of a work (NR)
$g Miscellaneous information (NR)
$h Medium (NR)
$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 (NR)
$t Title of a work (NR)
$v Volume/sequential designation (NR)
$6 Linkage (NR)
$8 Field link and sequence number (R)