Deleted; heading replaced by another heading:

Code x (Leader/05) indicates that the record has been deleted from a file and that a new authority record in which the heading from the deleted record appears as a 4XX See From Tracing field has been added to the file.

(In a system where authority control is linked to the bibliographic file, a computer can affect the one-to-one replacement indicated by code x without manual intervention.)

Example:

Leader/05  x

150  ##  $aOleomargarine

Leader/05  n

150  ##  $aMargarine

450  ##  $aOleomargarine