Columbia subject headings:
Aesthetics, Modern--20th century.
Art, German.
Art, Modern--20th century.
Westheim, Paul.
Harvard subject headings:
Aesthetics, Modern--20th century.
Art, German.
Art, Modern--20th century
Westheim, Paul
Princeton subject headings:
Aesthetics, Modern--20th century.
Art, German.
Art, Modern--20th century.
Westheim, Paul.