Tables of the value of gold and silver per ounce troy : at different degrees of fineness : with other tables which will be found useful to bankers, assayers, chemists, merchants, dealers in bullion and ores

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  Manual of practical assaying : intended for the use of metallurgists, captains of mines, and assayers in general. With copious tables for the purpose of ascertaining in assays of gold and silver the precise amount, in ounces, pennyweights, and grains of noble mental, contained in one ton of ore from a given quantity

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