022 INTERNATIONAL STANDARD SERIAL NUMBER (R)
Indicators First Level of international interest # Level of international interest not designated 0 Serial of international interest; full record registered with ISSN Network 1 Serial not of international interest; 2 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)