I would try Daniel Williman, Records of the Papal Rioght of Spoil 
1316-1412 (Paris, 1974).

I need to check my memory that part of the Avignon library was moved to 
Rome & is in the Borghese collection.  If so, try Anneliese Maier, 
Codices Burgesiani Bibliothecae Vaticanae (Studi e testi 170;  Rome 1952).

If you do not have access to these titles, contact me off list & I will 
look at the volumes.  

tom izbicki