Columbia subject headings:
Harvard subject headings:
Beuys, Joseph. 7000 oaks.
Documenta (Exhibition)
Documenta.
Princeton subject headings:
Beuys, Joseph.
Documenta (7th : 1982 : Kassel, Germany)
Trees in cities--Germany (West)--Kassel.
Trees, Care of--Germany (West)--Kassel--Citizen participation.
Urban forestry--Germany (West)--Kassel.