Columbia subject headings:
Agriculture--Middle East--History--Congresses.
Food supply--Middle East--Religious aspects--Congresses.
Grain--Middle East--History--Congresses.
Middle East--Civilization--To 622--Congresses.
Harvard subject headings:
Agriculture--Middle East--History--Congresses.
Food supply--Middle East--Religious aspects--Congresses.
Grain--Middle East--History--Congresses.
Middle East--Civilization--To 622--Congresses.
Princeton subject headings:
Grain--Middle East--History.
Grain--Political aspects--Middle East--History.
Grain--Religious aspects.
Grain--Social aspects--Middle East--History.
Middle East--Antiquities.