Columbia subject headings:
Music--Manuscripts--Facsimiles.
Operas--Scores.
Harvard subject headings:
Cato, Marcus Porcius, 95 B.C.-46 B.C.--Drama.
Music--Manuscripts--Facsimiles
Operas--Scores
Princeton subject headings:
Music--Manuscripts--Facsimiles.
Operas--Scores.
Operas.
Scores.