Columbia subject headings:
Harvard subject headings:
Gardens, European--History--20th century.
Gardens, European--History--21st century.
Gardens--Europe--Design--History--20th century.
Gardens--Europe--Design--History--21st century.
Landscape architects--Europe.
Landscape architecture--Europe--History--20th century.
Landscape architecture--Europe--History--21st century.
Princeton subject headings:
Gardens--Design.
Landscape design--Europe.
Landscape gardening--Europe.