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| View Original: | Treadwell Mines geologic map.PNG (1149x614) | |||
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| Keywords: Treadwell Mines geologic map.PNG en Treadwell Mines geologic map 1906-01-01 USGS Bulletin 287 The Juneau Gold Belt Alaska Arthur C Spencer other versions PD-USGov Douglas Island Gold mining in Alaska Geological maps of Alaska Treadwell Mines The Juneau Gold Belt Alaska USGS Bulletin 287 1906 | ||||
