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Title: Argentiferous and auriferous copper matt [Go to resource]
Description: Argentiferous and auriferous copper matt. From Boston and Colorado Works, Black Hawk, Colorado, presented by R. Pearce, 1875, with nos 1863-1870 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1889-164/1862 Go to resource More Like this...
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