Ego signo crucis non clipeo

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
264v
Sequence: 
2
Feast: 
Martini
Office/Mass: 
M
Genre: 
A
Position: 
1.4
Cantus ID: 
002587
Mode: 
7
Differentia: 
2
Differentia database: 
1--l-l-m-l-k-jk--4 144a
Addendum: 
P: 399