File:PSM V21 D440 Coal mine preparation for fracturing rock.jpg
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DescriptionPSM V21 D440 Coal mine preparation for fracturing rock.jpg | Coal mine preparation for fracturing rock | |||||
Date | ||||||
Source | Popular Science Monthly Volume 21 | |||||
Author | Unknown authorUnknown author | |||||
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current | 05:14, 26 August 2010 | 1,402 × 1,576 (290 KB) | Ineuw (talk | contribs) | {{Information |Description = Coal mine preparation for fracturing rock |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_21.djvu/440 |Date = 1882 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category: |
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