File:The Pittsburgh Coal Bed-Its Early History and Development.pdf
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The_Pittsburgh_Coal_Bed-Its_Early_History_and_Development.pdf (file size: 11.32 MB, MIME type: application/pdf)
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| current | 20:12, 17 February 2017 | (11.32 MB) | Kbrooks (talk | contribs) | File uploaded with MsUpload |
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