Columbia subject headings:
Industries--Size--Developing countries--Congresses.
Mines and mineral resources--Developing countries--Congresses.
Mines and mineral resources--Environmental aspects--Developing countries--Congresses.
Mines and mineral resources--Social aspects--Developing countries--Congresses.
Mining engineering--Appropriate technology--Developing countries--Congresses.
Harvard subject headings:
Industries--Size--Developing countries--Congresses.
Mines and mineral resources--Developing countries--Congresses.
Mines and mineral resources--Environmental aspects--Developing countries--Congresses.
Mines and mineral resources--Social aspects--Developing countries--Congresses.
Mining engineering--Appropriate technology--Developing countries--Congresses.
Princeton subject headings: