@hep2marc.over('<STR_LIT>', '<STR_LIT>')<EOL>@utils.for_each_value<EOL>def _collections2marc(self, key, value):
if value in COLLECTIONS_REVERSE_MAP:<EOL><INDENT>return {'<STR_LIT:a>': COLLECTIONS_REVERSE_MAP[value]}<EOL><DEDENT>
Populate the ``980`` MARC field.