Columbia subject headings:
Masses, Unaccompanied.
Motets.
Music--Manuscripts--Facsimiles.
Harvard subject headings:
Masses, Unaccompanied.
Motets.
Music--Manuscripts--Facsimiles
Princeton subject headings:
Masses, Unaccompanied.
Masses.
Motets.
Music--Manuscripts--Facsimiles.