Qui post me venit ante

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
001r
Sequence: 
2
Feast: 
Fer. 4 Hebd. 2 Adv.
Office/Mass: 
L
Genre: 
A
Position: 
B
Cantus ID: 
004493
Mode: 
4
Differentia: 
1
Differentia database: 
1--h-g-h-j-g-e--4 27a