Columbia subject headings:
Gardeners--Netherlands.
Gardens--Netherlands--Hummelo.
Natural gardens--Pictorial works.
Oudolf, Piet.
Harvard subject headings:
Gardeners--Netherlands.
Gardens--Design
Gardens--Netherlands--Hummelo.
Natural gardens--Pictorial works.
Oudolf, Piet.
Planting design.
Princeton subject headings:
Gardeners--Netherlands.
Gardens--Design.
Gardens--Netherlands--Hummelo.
Natural gardens--Pictorial works.
Oudolf, Piet.
Planting design.