Columbia subject headings:
Harvard subject headings:
Botswana--History--Congresses.
Human settlements--Botswana--History--Congresses.
Land use--Botswana--History--Congresses.
Princeton subject headings:
Botswana--History--Congresses.
Human settlements--Botswana--History--Congresses.
Land use--Botswana--History--Congresses.