Columbia subject headings:
Chronology, Historical--Charts, diagrams, etc.
Chronology, Historical--Maps.
Civilization--History.
Historical geography--Maps.
Maps.
Harvard subject headings:
Civilization--History--20th century.
Historical geography--Maps.
History, Modern--20th century--Maps.
Princeton subject headings:
Chronology, Historical--Charts, diagrams, etc.
Chronology, Historical--Maps.
Civilization--History.
Historical geography--Maps.
Maps.