Columbia subject headings:
Flour as food--Greece--History.
Flour as food--Rome--History.
Flour mills--Greece--Equipment and supplies--History.
Flour mills--Rome--Equipment and supplies--History.
Grain--Milling--Greece--History.
Grain--Milling--Rome--History.
Gristmills--Greece--History.
Gristmills--Rome--History.
Harvard subject headings:
Flour mills--History.
Flour--History.
Princeton subject headings:
Flour mills--History.
Flour--History.