Columbia subject headings:
Art dealers--Germany (West)--Biography.
Art, German--Germany--Düsseldorf--20th century--Exhibitions.
Art, German--Germany--Düsseldorf--Exhibitions.
Artists--Germany--Düsseldorf--Biography.
Ey, Johanna, 1864-1947--Friends and associates.
Ey, Johanna, 1864-1947--Portraits--Exhibitions.
Harvard subject headings:
Art dealers--Germany (West)--Biography.
Art dealers--Germany--Biography.
Art, German--Germany--Düsseldorf--20th century--Exhibitions.
Art, German--Germany--Düsseldorf--Exhibitions.
Art, Modern--20th century--Germany--Düsseldorf--Exhibitions.
Artists--Germany--Düsseldorf--Biography.
Ey, Johanna, 1864-1947--Friends and associates--Exhibitions.
Ey, Johanna, 1864-1947--Friends and associates.
Ey, Johanna, 1864-1947--Portraits--Exhibitions.
Princeton subject headings:
Ey, Johanna, 1864-1947--Art patronage--Exhibitions.