Columbia subject headings:
Harvard subject headings:
Art, European--19th century--Exhibitions
Art, European--20th century--Exhibitions
Europe--Civilization--19th century--Exhibitions.
Europe--Civilization--20th century--Exhibitions.
Exhibitions--Europe--History--19th century--Exhibitions.
Exhibitions--Europe--History--20th century--Exhibitions.
Princeton subject headings:
Discoveries in geography--History--19th century--Exhibitions.
Discoveries in geography--History--20th century--Exhibitions.
Exhibitions--Europe--History--19th century--Exhibitions.
Exhibitions--Europe--History--20th century--Exhibitions.
Technological innovations--Europe--History--19th century--Exhibitions.
Technological innovations--Europe--History--20th century--Exhibitions.