Columbia subject headings:
Mineral industries--New Spain--History.
Precious metals--New Spain--History.
Harvard subject headings:
Mineral industries--New Spain--History--Statistics.
Mineral industries--New Spain--History.
Precious metals--New Spain--History--Statistics.
Precious metals--New Spain--History.
Princeton subject headings:
Mineral industries--New Spain--History.
Precious metals--New Spain--History.