Missus est Gabriel angelus ad

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
009r
Sequence: 
7
Feast: 
Fer. 4 Hebd. 3 Adv.
Office/Mass: 
L
Genre: 
A
Position: 
B
Cantus ID: 
003794
Mode: 
8
Differentia-Old: 
1
Addendum: 
P: 018
Manuscript Reading Full Text (standardized spelling): 
Missus est Gabriel angelus ad Mariam virginem desponsatam Joseph
Manuscript Reading Full Text (MS spelling): 
Missus est gabriel angelus ad mariam virginem desponsatam ioseph | Bened-