Columbia subject headings:
Harvard subject headings:
Agricultural laborers--Iraq--Babylonia--History.
Agricultural laborers--Iraq--Sumer--History.
Labor market--Iraq--Babylonia--History.
Labor market--Iraq--Sumer--History.
Slavery--Iraq--Babylonia--History.
Slaves--Iraq--Sumer--History.
Princeton subject headings:
Iraq--History--To 634.
Sumerians.
Working class--Iraq--History.