Columbia subject headings:
Historic gardens--Germany--Emscher-Lippe Region.
Landscape architecture--Germany--Emscher-Lippe Region.
Landscape gardening--Germany--Emscher-Lippe Region--History.
Harvard subject headings:
Gardens in art--Exhibitions.
Historic gardens--Germany--Emscher-Lippe region--Exhibitions.
Historic gardens--Germany--Emscher-Lippe region.
Landscape architecture--Germany--Emscher-Lippe region--Exhibitions.
Landscape architecture--Germany--Emscher-Lippe region.
Landscape gardening--Germany--Emscher-Lippe region--History--Exhibitions.
Landscape gardening--Germany--Emscher-Lippe region--History.
Ludwig Galerie Schloss Oberhausen--Exhibitions.
Princeton subject headings: