Ecce de quo Joannes dixit

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
034v
Sequence: 
2
Feast: 
Nativitas Domini,8
Office/Mass: 
X
Genre: 
A
Position: 
5
Cantus ID: 
002501
Mode: 
8
Differentia: 
1
Differentia database: 
1--k-k-j-k-h-g--4 118a