Give later date as guessed
Add copyright publication date
 
LCRI Rule 1.4F7
 
Example:
 
Bib record:
 
260 ‡c [199-?]
 
008 Publication status:         s
008 Date 1:                  199u
008 Date 2                  [blank]
 
END, unless this sound material is a re-release
 
Is this sound material a re-release?
 
Yes                 No