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:'''2''' Difference
==SubfieldsПідполя==
===<span id="a"></span>$a Standard Number===
to type.
===<span id="b"></span>$b Qualification===
relationship of a number or code to a set or to a particular volume.
===<span id="c"></span>$c Additional codes following standard number or codes===
Contains any coded suffix to the identifier.
===<span id="d"></span>$d Terms of Availability and/or Price===
The price of the item and any comment on its availability.
===<span id="z"></span>$z Erroneous Number or Code===
and in this instance cancelled or it may have been incorrectly printed.
==Related Fields==