Beschrijving
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 Etc.
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 Etc.
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 Etc.