Haec virgo sancta atque

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
281v
Sequence: 
8
Feast: 
Comm. plurimorum Virginum
Office/Mass: 
M
Genre: 
R
Position: 
3.2
Cantus ID: 
601006
Mode: 
7
Addendum: 
P: 433