Columbia subject headings:
Cocoa trade--Statistics--Periodicals.
Coffee industry--Statistics--Periodicals.
Oil industries--Statistics--Periodicals.
Spice trade--Statistics--Periodicals.
Tea trade--Statistics--Periodicals.
Tropical fruit industry--Statistics--Periodicals.
Tropical vegetable industry--Statistics--Periodicals.
Harvard subject headings:
Cocoa trade--Statistics--Periodicals.
Coffee industry--Statistics--Periodicals.
Oil industries--Statistics--Periodicals.
Spice trade--Statistics--Periodicals.
Tea trade--Statistics--Periodicals.
Tropical fruit industry--Statistics--Periodicals.
Tropical vegetable industry--Statistics--Periodicals.
Princeton subject headings: