Columbia subject headings:
Art, German--Germany, Northern--20th century.
Art, German--Germany, Northern--21st century.
Art, Polish--Poland--Western and Northern Territories--20th century.
Art, Polish--Poland--Western and Northern Territories--21st century.
Harvard subject headings:
Art, German--Germany, Northern--20th century.
Art, German--Germany, Northern--21st century.
Art, Polish--Poland--Western and Northern Territories--20th century.
Art, Polish--Poland--Western and Northern Territories--21st century.
Princeton subject headings:
Art, German--Germany, Northern--20th century.
Art, German--Germany, Northern--21st century.
Art, Polish--Poland--Western and Northern Territories--20th century.
Art, Polish--Poland--Western and Northern Territories--21st century.