Columbia subject headings:
Cowries.
Musical instruments, Ancient.
Pearls.
Purpura (Mollusks)
Shells.
Harvard subject headings:
Cowries.
Musical instruments, Ancient.
Musical instruments, Prehistoric
Pearls
Purpura (Mollusks)
Purpura.
Shells.
Princeton subject headings:
Cowries.
Musical instruments, Primitive.
Pearls.
Purpura.
Shells.