The Assayer's Guide; or, Practical Directions to Assayers, Miners and Smelters, for the Tests and Assays, by Heat and by wet Processes, of the Ores of all the Principal Metals, of Gold and Silver Coins and Alloys, and of Coal, &c. By Oscar M. Lieber ..: Buy The Assayer's Guide; or, Practical Directions to Assayers, Miners and Smelters, for the Tests and Assays, by Heat and by wet Processes, of the Ores of all the Principal Metals, of Gold and Silver Coins and Alloys, and of Coal, &c. By Oscar M. Lieber .. by Lieber Oscar M 1830-1862 at Low Price in India