Columbia subject headings:
Rome--Politics and government--265-30 B.C.
Rome--Politics and government--30 B.C.-68 A.D.
Harvard subject headings:
Rome--Politics and government--265 B.C.-30 B.C.
Rome--Politics and government--30 B.C.-68 A.D.
Princeton subject headings:
Rome--Politics and government--265-30 B.C.
Rome--Politics and government--30 B.C.-68 A.D.