Columbia subject headings:
Botswana--Economic conditions--1966---Statistics.
Botswana--Social conditions--Statistics.
Economic indicators--Botswana.
Social indicators--Botswana.
Harvard subject headings:
Botswana--Economic conditions--1966---Statistics.
Botswana--Social conditions--Statistics.
Economic indicators--Botswana.
Social indicators--Botswana.
Princeton subject headings: