Aperiens Petrus os suum dixit

Source: 
Cambridge, University Library, Mm.ii.9
Folio: 
445
Sequence: 
3
Feast: 
Petri, Pauli
Office/Mass: 
M
Genre: 
A
Position: 
3.2
Cantus ID: 
001445
Mode: 
8
Differentia: 
1
Differentia database: 
1--k-k-j-k-h-g--4 118a
Extra: 
2