Brüssel, Bibliothèque royale de Belgique, Ms IV 922

Choirbook containing Masses, Motets and Hyms by various composers such as van Weerbecke, de la Rue, Mouton, Josquin….
Facsimile published by Alamire Foundation
Please note their terms of use!!

http://www.idemdatabase.org/alamire/items/show/91