Columbia subject headings:
Harvard subject headings:
Wheat trade--Greece--Piraeus--History.
Wheat--Prices--Government policy--Greece--Piraeus--History.
Wheat--Prices--Greece--Piraeus--History.
Princeton subject headings:
Wheat trade--Greece--Piraeus--History.
Wheat--Prices--Government policy--Greece--Piraeus--History.
Wheat--Prices--Greece--Piraeus--History.