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- Pinch in quartz vein from 24 to 6 inches, North Star mine, No... -

Photo id: 249323 - Pinch in quartz vein from 24 to 6 inches, North Star mine, No... Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein, 7,200-foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 9-F, U.S.Geological Survey Professional paper 194. 1940. - ID. Johnston, W.D., Jr. 73 - jwdj0073 - U.S. Geological Survey - Public domain image Dimensioni del file: 82478 bytes Foto visualizzata 274 volte

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