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The milling of gold ores in California
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The Boston Milling & Manufacturing Co.'s improved machinery for working gold and silver ores
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Manuscripts
The collection contains letters, documents, maps and reports related to the professional activities of mining engineer Harley A. Sill. There are reports on ores and mines and technical data, chiefly from California, Arizona, Nevada, Canada and Mexico. There are also some reports on mines in other parts of the United States and in South and Central America. There is also one small box containing bibliographical references related to mines and metallurgy (Box 15).
mssSill papers
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Great American issues : political social economic (a constructive study)
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