Columbia subject headings:
Conservation of natural resources--Turkey--Congresses.
Environmental policy--Turkey--Congresses.
Environmental protection--Turkey--Congresses.
Pollution--Turkey--Congresses.
Harvard subject headings:
Conservation of natural resources--Turkey--Congresses.
Environmental policy--Turkey--Congresses.
Environmental protection--Turkey--Congresses.
Pollution--Turkey--Congresses.
Princeton subject headings:
Conservation of natural resources--Turkey--Congresses.
Environmental policy--Turkey--Congresses.
Environmental protection--Turkey--Congresses.
Pollution--Environmental aspects--Turkey--Congresses.