Columbia subject headings:
Conservation of natural resources--Zambia--Congresses.
Education--Zambia--Congresses.
Environmental policy--Zambia--Congresses.
Zambia--Population--Congresses.
Harvard subject headings:
Conservation of natural resources--Zambia--Congresses.
Education--Zambia--Congresses.
Environmental protection--Zambia--Congresses.
Zambia--Population--Congresses.
Zambia--Population--Environmental aspects--Congresses.
Princeton subject headings: