Columbia subject headings:
Barba, Alvaro Alonso, 1569-
Metallurgists--Bolivia--Biography.
Mineralogists--Bolivia--Biography.
Harvard subject headings:
Barba, Alvaro Alonso, 1569-
Metallurgists--Bolivia--Biography.
Mineralogists--Bolivia--Biography.
Princeton subject headings:
Barba, Alvaro Alonso, 1569-
Gold--Bolivia--Metallurgy.
Silver--Bolivia--Metallurgy.