Columbia subject headings:
Harvard subject headings:
Arts, Modern--20th century--Dictionaries--German.
Avant-garde (Aesthetics)--History--20th century--Dictionaries--German.
Princeton subject headings:
Art, Modern--20th century--Dictionaries--German.
Arts, Modern--20th century--Encyclopedias.
Avant-garde (Aesthetics)--Dictionaries--German.
Avant-garde (Aesthetics)--Encyclopedias.
Dictionaries.
Encyclopedias.