Societas Universalis Sanctae Ceciliae 1966-1972.
All volumes are clothbound.
Hymnen I. Die mittelalterlichen Hymnenmelodien des Abendlandes. Edited by David Hiley 2 Vols.cplt. Alleluia-Melodien I, bis 1100. Alleluia-Melodien II, ab 1100. Germany All volumes are paperbound.