Liturgy of the Hours
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An Incentive to Prayer, by Cardinal Spellman
An introduction to the Roman Breviary
Catholic Encyclopedia:
Breviary
Canonical Hours
Compline
Divine Office
Lauds
Matins
Music of Vespers
Nocturns
None
Prime
Reform of the Roman Breviary
Sext
Terce
Vespers
Documents, Articles etc.
John Paul II, General Audience, Wednesday 4 April 2001
John Paul II, General Audience, Wednesday 28 March 2001
Lectio Divina
Liturgy of the Hours
Pray the Psalms Daily, Blue Cloud Abbey
Short Breviaries in 20th Century America
The Daily Office
Universalis