Baron Inigo Born's New process of amalgamation of gold and silver ores, and other metallic mixtures [Microform] : as by his late Imperial Majesty's commands introduced in Hungary and Bohemia / from the Baron's account in German, translated into English by R.E. Raspe ; to which are added a supplement or a comparative view of the former method of melting and refining ; and an address to the subscribers, giving an account of its latest improvements.