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| View Original: | Underground_Coal_Mines_in_the_US.svg (792x612) | |||
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| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Underground Coal Mines in the US.svg en Locations of underground coal mines in the US 2012-01-01 CDC website coal mining US Dept of Health Center for Disease Control other versions PD-USGov Uploaded with UploadWizard Uncategorized 2015 September 12 | ||||
