Columbia subject headings:
Copper industry and trade--Congresses.
Copper industry and trade--Government policy--Chile--Congresses.
Intergovernmental Council of Copper Exporting Countries--Congresses.
Harvard subject headings:
Copper industry and trade--Congresses.
Copper industry and trade--Government policy--Chile--Congresses.
Intergovernmental Council of Copper Exporting Countries--Congresses.
Princeton subject headings:
Copper industry and trade--Congresses.
Copper industry and trade--Government policy--Chile--Congresses.
Intergovernmental Council of Copper Exporting Countries--Congresses.