Free Preview of The Assayer's Guide; Or, Practical Directions to Assayers, Miners, and Smelters: For the Tests and Assays, by Heat and Wet Processes, of the Ores of All the Principal Metals, of Go
The Assayer's Guide; Or, Practical Directions to Assayers, Miners, and Smelters: For the Tests and Assays, by Heat and Wet Processes, of the Ores of All the Principal Metals, of Go