022 INTERNATIONAL STANDARD SERIAL NUMBER (R)
Indicators
First Level of international interest
^ Level of international interest not specified
0 Serial of international interest;
full record registered with ISSN Network
1 Serial not of international interest;
abbreviated record registered with ISSN Network
Second Undefined; contains a blank (^)
Subfield Codes
$a International Standard Serial Number (NR)
$y Incorrect ISSN (R)
$z Cancelled ISSN (R)
$6 Linkage (NR)
$8 Field link and sequence number (R)