Columbia subject headings:
Gregorian chants.
Music--500-1400--Bibliography.
Music--Manuscripts--Facsimiles.
Tropes (Music)
Tropes (Music)--Bibliography.
Harvard subject headings:
Manuscripts, Latin--Catalogs.
Music--Manuscripts--Catalogs
Tropes (Music)--History--Sources--Manuscripts--Catalogs.
Tropes (Music)--Manuscripts--Catalogs.
Princeton subject headings:
Facsimiles.
Gregorian chants.
Music--500-1400--Bibliography.
Music--Manuscripts--Facsimiles.
Tropes (Music)
Tropes (Music)--Bibliography.