Columbia subject headings:
Nonferrous metal industries--Spain--Castile--History.
Nonferrous metals--Spain--Castile--Metallurgy--History.
Nonferrous metals--Spain--Castile.
Harvard subject headings:
Princeton subject headings:
Nonferrous metal industries--Spain--Castile--History.
Nonferrous metals--Spain--Castile--Metallurgy--History.
Nonferrous metals--Spain--Castile.