Columbia subject headings:
Mines and mineral resources--America--History.
Mines and mineral resources--Central America--History.
Mines and mineral resources--North America--History.
Mines and mineral resources--South America--History.
Harvard subject headings:
Mines and mineral resources--America--History.
Mines and mineral resources--Central America--History.
Mines and mineral resources--North America--History.
Mines and mineral resources--South America--History.
Princeton subject headings:
Mines and mineral resources--America--History.
Mines and mineral resources--Central America--History.
Mines and mineral resources--North America--History.
Mines and mineral resources--South America--History.