Dixit angelus ad Petrum

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
221v
Sequence: 
4
Feast: 
Petri
Office/Mass: 
M
Genre: 
A
Position: 
2.3
Cantus ID: 
002268
Mode: 
8
Differentia: 
2
Differentia database: 
1--k-k-h-k-l-k--4 99d