Columbia subject headings:
Drawing, European--20th century--Exhibitions.
Drawing, European--Exhibitions.
Prints, European--Exhibitions.
Prints--Europe--19th century--Exhibitions.
Prints--Europe--20th century--Exhibitions.
Städtische Galerie Albstadt--Anniversaries, etc.--Exhibitions.
Watercolor painting, European--20th century--Exhibitions.
Watercolor painting, European--Exhibitions.
Harvard subject headings:
Art, European--20th century--Exhibitions
Drawing, European--20th century--Exhibitions
Nature (Aesthetics)--Exhibitions
Princeton subject headings:
Art, European--20th century--Exhibitions.