... Lintong county, about thirty kilometers east of Xi'an, unearthed some brown pottery fragments, which led ... of the 1egion.Vault 3 is a modest building more resembling a gallery. It has 69 pottery ... revealed the sword to have been cast of an alloy of copper, tin and various other elements ... original formations. Vault 2 is equipped with devices for regulating temperature, lighting and air humidity Terra ...