On the Use of the Tridentine Liturgy
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On the Use of the Tridentine Liturgy was a document issued in 1984 by the Congregation for Divine Worship and the Discipline of the Sacraments.
It allowed the Tridentine Mass to be said under a fairly limited regime. It was expanded in 1988 by the Apostolic letter Ecclesia Dei which called for a "wide and generous" provision of the Tridentine liturgy within the Catholic church.