Columbia subject headings:
Caesar, Julius.
Great Britain--History--Invasions.
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Harvard subject headings:
Caesar, Julius--Invasion of Britain, 55 B.C.
Great Britain--History--Invasions.
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Princeton subject headings: