MacGregor 1992: Fire and light in the western Triduum. Their use at Tenebrae and at the Paschal Vigil Author: A.J. MacGregor Publication Date: 1992 Content Type: Book A.J. MacGregor Fire and light in the western Triduum. Their use at Tenebrae and at the Paschal Vigil (Alcuin Club Collection 71) Collegeville 1992 The Liturgical Press, ISBNÂ : 0-8146-2066-3 546 pp.