Columbia subject headings:
Harvard subject headings:
Copper ores--Andes Region.
Copper ores--Argentina.
Copper ores--Chile.
Copper ores--Peru.
Princeton subject headings:
Copper ores--Andes Region--Congresses.
Copper ores--Argentina--Congresses.
Copper ores--Chile--Congresses.
Copper ores--Peru--Congresses.