Columbia subject headings:
Harvard subject headings:
History, Modern--18th century--Chronology.
History, Modern--19th century--Chronology.
History, Modern--20th century--Chronology
History, Modern--Chronology.
Princeton subject headings:
History, Modern--18th century--Chronology.
History, Modern--19th century--Chronology.
History, Modern--20th century--Chronology.