Columbia subject headings:
Applied ecology--Congresses.
Ecological landscape design--Congresses.
Geographical perception--Congresses.
Landscape assessment--Philosophy--Congresses.
Landscape ecology--Congresses.
Space--Congresses.
Harvard subject headings:
Applied ecology--Congresses.
Ecological landscape design--Congresses.
Ecology--Political aspects--Congresses.
Human ecology--Congresses
Princeton subject headings: