Perpendo Petre quid tolero

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
095r
Sequence: 
2
Feast: 
Gregorii
Office/Mass: 
M
Genre: 
A
Position: 
2.3
Cantus ID: 
004273
Mode: 
1
Differentia: 
3
Differentia database: 
1--h-h-g-f-gh-gf--4 69b