Display constants for field 642:

Form of number in series a.e.:  [associated with the content of subfield $a]

Applies to:  [associated with the content of subfield $d]

( ... )  [parentheses associated with the content of subfield $5]

Phrases such as Form of number in series a.e.: and Applies to: are not carried in the MARC record.  They may be system generated as display constants associated with the content of subfields $a and $d, respectively.

Parentheses enclosing the MARC code are not carried in the record.  They may be system generated as a display constant associated with the content of subfield $5.

Content designated field:

642  ##  $av. 3, no. 4$ditems published before <1979>$5DLC

Display example:

Form of number in series a.e.:  v. 3, no. 4  Applies to:  items published before <1979>  (DLC)