Columbia subject headings:
Harvard subject headings:
Alemán, Mateo, 1547-1614?
Forced labor--Spain--Almadén Region--History--16th century.
Mercury miners--Spain--Almadén Region--History--16th century.
Mercury mines and mining--Spain--Almadén Region--History--16th century.
Princeton subject headings:
Forced labor--Spain--Almadén.
Mercury miners--Spain--Almadén.