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Contour Surface Coal Mines, West Virginia Inspecting Coal Mining Permits using Unmanned Aircraft Systems November 7-8, 2011 The Office of Surface Mining (OSM) inquired
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Document Date: 2012-01-19 10:44:01
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Contour Surface Coal Mines, West Virginia Inspecting Coal Mining Permits using Unmanned Aircraft Systems November 7-8, 2011 The Office of Surface Mining (OSM) inquired