because another aim of the reform was simplicity. Hence they chose to present the psalm-prayers in a separate book: the Supplement. Pinell's work outside the reform of the liturgy Eventually in 1971 the renewed Liturgy of the Hours was published without a supplement. Pinell published his work a year later in 1972. Contrary to the previous editions of the psalm-prayers presenting three series of such prayers depended on their assumed origin (African, Roman, Spanish). LOP, though limited to one Spanish series, includes a 300-page general introduction to the psalm-prayers and the critical apparatus attached to each. The apparatus provides references to all sources testifying to a prayer. The range of sources is much wider than in aforementioned works, whose editors used only psalters containing the prayers following each psalm. The sources of LOP include the Mozarabic psalter preserved in an 11th-century manuscript from the Spanish Abbey of Santo Domingo de Silos, Liber Misticus or Mixtus (10th–11th century), Liber Orationum Festivus (8th–9th century), Liber Ordinum (11th century), Liber Horarum (11th century). Pinell considered early modern printed books from such as Breviarium secundum regulam beati Isidori (Toledo 1502) or Breviarium Gothicum (Madrid 1775). LOP's diversity of sources explain the presence of the word 're-composition' in its subtitle. Paradoxically, this feature could be a motive for the editors' decision to leave this book outside the Liturgy of the Hours. Pinell does not always put together all these prayers in a convincing way and sometimes makes arbitrary decisions about his collection's structure, composing rather than re-composing, so his work is somewhat artificial. Nevertheless, that diversity of sources remains its strongest point. References External links General Instruction of the Liturgy of the Hours Mozarabic Psalter Psalters