The Mining Magazine and Journal of Geology, Mineralogy, Metallurgy, Chemistry and the Arts in Their Applications to Mining and Working Useful Ores and Metals
... imagine , and a singular fact is , that the most delicate markings , or ... lead region . PHYSIOGNOMY OF THE LEAD REGION . Imagine a natural amphitheatre or circular valley of ... sheet ore 132 Geology of the Upper Mississippi Lead Region .
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