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Figure 28 Photograph of interlaminated carbonaceous shale and bright to dull coal close to the margin of the Sullivan channel in the Oaktown Mine in Knox County, Indiana.

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current19:14, 10 July 2020Thumbnail for version as of 19:14, 10 July 20202,067 × 2,494 (1.24 MB)ILSTRAT (talk | contribs)

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