024 STANDARD RECORDING NUMBER (NR)
Indicators
First Type of standard number or code
0 International Standard Recording Code
1 Universal Product Code
2 International Standard Music Number
3 International Article Number
4 Serial Item and Contribution Identifier
7 Source specified in subfield $2
8 Unspecified type of standard number or code
Second Difference indicator
# No information provided
0 No difference
1 Difference
Subfield Codes
$a Standard recording code (NR)
$c Terms of availability (NR)
$d Additional codes following the standard code (NR)
$z Cancelled/invalid standard code (R)
$2 Source of number or code (NR)