La Trobe University - Library: Medieval Music Database - Annual cycle of feasts of liturgical chant, liturgical polyphony and secular music of the late middle ages.

The Works of Henricus de Libero Castro

Agnus Dei from Strasbourg: Bibliothèque Municipale
Sanctus summa tua gloria from Strasbourg: Bibliothèque Municipale
Virgo dulcis atque pia sacred song