Columbia subject headings:
Art, Modern--20th century--Congresses.
Art, Modern--21st century--Congresses.
Art, Polish--20th century--Congresses.
Art, Polish--21st century--Congresses.
Art, Spanish--20th century--Congresses.
Art, Spanish--21st century--Congresses.
Poland--Civilization--20th century--Congresses.
Poland--Civilization--21st century--Congresses.
Spain--Civilization--20th century--Congresses.
Spain--Civilization--21st century--Congresses.
Harvard subject headings:
Art, Modern--20th century--Congresses
Art, Modern--21st century--Congresses.
Art, Polish--20th century--Congresses.
Art, Polish--21st century--Congresses.
Art, Spanish--20th century--Congresses.
Art, Spanish--21st century--Congresses.
Poland--Civilization--20th century--Congresses.
Poland--Civilization--21st century--Congresses.
Spain--Civilization--20th century--Congresses.
Spain--Civilization--21st century--Congresses.
Princeton subject headings:
Art, Modern--20th century--Congresses.
Art, Modern--21st century--Congresses.
Art, Polish--20th century--Congresses.
Art, Polish--21st century--Congresses.
Art, Spanish--20th century--Congresses.
Art, Spanish--21st century--Congresses.
Poland--Civilization--20th century--Congresses.
Poland--Civilization--21st century--Congresses.
Spain--Civilization--20th century--Congresses.
Spain--Civilization--21st century--Congresses.