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    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, late geologist to the state of Mississipi
    “…Practical directions to assayers, miners, and smelters, for the tests and assays, by heat…”
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