[Amazon.com] Practical Instructions for the Determination by Furnace Assay of Gold and Silver in Rocks and Ores

[Amazon.com] Pre/Post Assay Precious Content Purity Acid-Test Kit- Gold Silver Platinum Cupel Furnace Testing

[Amazon.com] **REPRINT** Practical instructions for the determination by furnace assay of gold and silver in rocks and ores [microform]

[Amazon.com] UFO Micro Furnace

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