In medio ecclesiae aperuit os

Source: 
Cambrai, Bibliothèque municipale, Impr. XVI C 4
Folio: 
219r
Sequence: 
6
Feast: 
Comm. unius Confessoris
Office/Mass: 
M
Genre: 
R
Position: 
3.5
Cantus ID: 
006913
Mode: 
1