(Guido), Küstel G. Roasting of Gold and Silver Ores: And the Extraction of Their Respective Metals Without Quicksilver Küstel, Guido A Treatise On Concentration Of All Kinds Of Ores: Including The Chlorination Process For Gold-bearing Sulphurets, Arseniurets, And Gold And Silver Ores Generally Sök bara efter: Küstel, Guido
