Display constant for field 641:

-Cf.  [associated with the content of subfield $z]

The instruction term -Cf. is not carried in the MARC record.  It may be system generated as a display constant associated with the content of subfield $z.

Content designated field:

641  ##  $aNo. 7 never published$zno. 11, t.p. verso

Display example:

No. 7 never published-Cf. no. 11, t.p. verso