Columbia subject headings:
Harvard subject headings:
Landscape architecture--Denmark--Designs and plans.
Landscape architecture--Denmark--History--20th century.
Landscape architecture--Europe--Designs and plans.
Landscape architecture--Europe--History--20th century.
Princeton subject headings:
Architecture, Modern--20th century--Denmark.
Architecture, Modern--20th century--Europe.
Architecture--United States--History--20th century.
Gardens--Denmark--Design--History--20th century.
Gardens--Europe--Design--History--20th century.
Gardens--United States--Design--History--20th century.
Landscape design--Denmark--History--20th century.
Landscape design--Europe--History--20th century.
Landscape design--United States--History--20th century.