028 PUBLISHER NUMBER FOR MUSIC (R)Indicators First Type of publisher number 0 Issue number 1 Matrix number 2 Plate number 3 Other publisher number 4 Videorecording number Second Note/added entry controller 0 No note, no added entry 1 Note, added entry required 2 Note, no added entry 3 No note, added entry requiredSubfield Codes $a Publisher number (NR) $b Source (NR) $6 Linkage (NR)