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Subfields Description
===$a Початкова або єдина дата===''Date of Beginning or Unique Date===(англ.)''
The first or unique date that is associated with the entity described in the 2XX field.
This date includes:
Date Reliability 1 9
The data element Era is mandatory if the subfield is used.
===$b Final DateКінцева дата===''Final Date (англ.)''
The latest date in the period that is associated with the entity described in the 2XX field.
This date includes: