In four parts. Part I. and II.: Containing the Art of metals, written originally in Spanish. By the learned Albaro Alonso Barba. Translated by the Earl of Sandwich, in the year 1669. Part III: Containing that Invaluable piece of Mr. G. Plattes. Part IV: Houghton"s Compleat Miner. This book, "A collection of scarce and valuable treatises upon metals, mines and minerals", by Alvaro A. Barba, Gabriel Plattes, Thomas Green, is a replication of a book originally published before 1738. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.