Columbia subject headings:
Prostitution--Japan--Okinawa-ken--History--20th century.
Prostitution--Japan--Okinawa-ken--History--21st century.
Harvard subject headings:
Prostitution--Japan--History
Prostitution--Japan--Okinawa-ken--History--20th century.
Prostitution--Japan--Okinawa-ken--History--21st century.
Princeton subject headings:
Prostitution--Japan--History.