Columbia subject headings:
International trade--Statistics--Handbooks, manuals, etc.
Service industries--Statistics--Handbooks, manuals, etc.
Harvard subject headings:
International trade--Statistics--Handbooks, manuals, etc.
Service industries--Statistics--Handbooks, manuals, etc.
Princeton subject headings:
International trade--Statistics--Handbooks, manuals, etc.
Service industries--Statistics--Handbooks, manuals, etc.
Statistics.