Columbia subject headings:
Harvard subject headings:
Aesthetics, Modern--20th century--Congresses.
Aesthetics, Modern--20th century.
Avant-garde (Aesthetics)--Europe--History--20th century--Congresses.
Avant-garde (Aesthetics)--Europe--History--20th century.
Einstein, Carl, 1885-1940--Aesthetics.
Einstein, Carl, 1885-1940--Congresses.
Princeton subject headings:
Aesthetics, Modern--20th century.
Avant-garde (Aesthetics)--Europe--History--20th century.
Einstein, Carl, 1885-1940--Aesthetics.