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<datafield tag="650" ind1=" " ind2="7">
<subfield code="a">Sciences</subfield>
<subfield code="x">Philosophie.</subfield>
<subfield code="2">ram.</subfield>
<subfield code="0">(OSt)16</subfield>

use strict;
use warnings;
...
$href->set_text ($text);
$href->print ();
}