File:Thin section of sandstone core as viewed through one of the USGS Core Research Center's microscopes.jpg
![File:Thin section of sandstone core as viewed through one of the USGS Core Research Center's microscopes.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/Thin_section_of_sandstone_core_as_viewed_through_one_of_the_USGS_Core_Research_Center%27s_microscopes.jpg/800px-Thin_section_of_sandstone_core_as_viewed_through_one_of_the_USGS_Core_Research_Center%27s_microscopes.jpg)
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current | 02:56, 29 April 2007 | ![]() | 2,304 × 1,728 (1.76 MB) | Joshuahicks |
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