Hughes, Thomas 1818-1883 The Gold-seeker's Handbook and Practical Assayist [microform]: Intended to Be Used in the Detection of Gold, Silver, Copper, and Other Metals Found in ... so Simplified as to Be Understood By...
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The Gold-seeker's Handbook and Practical Assayist [microform]: Intended to Be Used in the Detection of Gold, Silver, Copper, and Other Metals Found in ... so Simplified as to Be Understood By...