Columbia subject headings:
Silver mines and mining--Latin America--History--Congresses.
Silverwork--Latin America--History--Congresses.
Harvard subject headings:
Silver miners and mining--Latin America--History--Congresses.
Silverwork--Latin America--History--Congresses.
Princeton subject headings:
Silver miners and mining--Latin America--History--Congresses.
Silverwork--Latin America--History--Congresses.