Sanctus Gregorius mox ut

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
023v
Sequence: 
1
Feast: 
Gregorii, Mart.
Office/Mass: 
L
Genre: 
A
Position: 
2
Cantus ID: 
204507
Mode: 
2
Differentia: 
1
Differentia database: 
1--f-f-f-ed-cd-d--4 153e