Columbia subject headings:
Harvard subject headings:
Engelhardt, Walter von, Baron, 1864-1940.
Gardens--Germany--Düsseldorf--History.
Landscape architects--Germany.
Landscape architecture--Germany--Düsseldorf--History.
Princeton subject headings:
Engelhardt, Walter von, Baron, 1864-1940.
Gardens--Germany--Düsseldorf--History.
Landscape architects--Germany.
Landscape architecture--Germany--Düsseldorf--History.