Columbia subject headings:
Ludmilla, Duchess of Bohemia, Saint, 860?-921--Songs and music.
Oratorios--Vocal scores with piano.
Harvard subject headings:
Oratorios--Vocal scores with piano.
Princeton subject headings:
Arrangements (Music)
Ludmilla, Duchess of Bohemia, Saint, 860?-921--Songs and music.
Oratorios--Vocal scores with piano.
Oratorios.
Vocal scores.