Columbia subject headings:
Harvard subject headings:
Astronomy, Greek.
Mathematics, Greek.
Music, Greek and Roman.
Platonic number.
Theon, of Smyrna. Expositio rerum mathematicarum ad legendum Platonem utilium
Princeton subject headings:
Astronomy, Greek.
Mathematics, Greek.
Music, Greek and Roman.
Platonic number.
Theon, of Smyrna. Expositio rerum mathematicarum ad legendum Platonem utilium.