Columbia subject headings:
Basilica di San Pietro in Vaticano.
Biblioteca apostolica vaticana. Manuscript. Arch. Cap. S. Pietro B 80.
Church music--Vatican City--15th century--History and criticism.
Harvard subject headings:
Basilica di San Pietro in Vaticano.
Biblioteca apostolica vaticana. Manuscript. San Pietro B 80.
Church music--Vatican City.
Music--Italy--15th century--History and criticism.
Princeton subject headings: