Boston and Colorado smelting works. Black Hawk district, Colorado Silver bar shipment; value. 1874 P:4 c.1 Silver ore shipment; value. Silver shipments; value, Black Hack district, Colo. Bullion shipment; value. R.M.News..May 21,1874 p.4 c.1 Premium, award, territorial exposition; Denver. R.M.NsSept. 27,1874 p.4 c.6
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