Columbia subject headings:
Developing countries--Commerce--Statistics.
Developing countries--Economic conditions--Statistics.
Economic indicators--Developing countries--Statistics.
Harvard subject headings:
Balance of payments--Developing countries.
Commerce
Developing countries--Commerce.
Economic indicators--Developing countries.
Princeton subject headings:
Commercial statistics--Handbooks, manuals, etc.
Economic development--Statistics--Handbooks, manuals, etc.
International trade--Statistics.
Statistics.