Henfrey, Benjamin. A plan with proposals for forming a company to work mines in the United States : and to smelt and refine the ores, whether of copper, lead, tin, silver, or gold / by Benjamin Henfrey --

Henfrey, Benjamin.

A plan with proposals for forming a company to work mines in the United States : and to smelt and refine the ores, whether of copper, lead, tin, silver, or gold / by Benjamin Henfrey --

Philadelphia : Printed by Snowden & McCorkle, 1797.

Penrose Hoopes Collection (c.1)

Gap copper mines.

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