Unus ex duobus qui secuti

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
277r
Sequence: 
6
Feast: 
Andreae
Office/Mass: 
V2
Genre: 
A
Position: 
2
Cantus ID: 
005279
Mode: 
1
Differentia: 
3
Differentia database: 
1--h-h-g-f-gh-gf--4 69b