Columbia subject headings:
Dion, Roger, 1896-1981.
Greece--Historical geography.
Historians--Greece.
Historians--Rome.
Rome--Historical geography.
Harvard subject headings:
Classical literature.
Dion, Roger, 1896-
Rome--Historical geography.
Princeton subject headings:
Dion, Roger, 1896-1981.
Greece--Historical geography.
Historians--Greece.
Historians--Rome.
Rome--Historical geography.