Columbia subject headings:
Greece--Civilization.
Rome--Civilization.
Slavery--Greece--Historiography.
Slavery--Historiography.
Slavery--Rome--Historiography.
Harvard subject headings:
Greece--Civilization.
Rome--Civilization
Slavery--Greece--History
Slavery--Historiography.
Slavery--Rome--History
Princeton subject headings:
Greece--Civilization.
Rome--Civilization.
Slavery--Greece--History.
Slavery--Rome--History.