Pennsylvania law requires covering of coal at bottom of last cut. This photo illustrates Pennsylvania grading.

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5783_fn_a.jpg (530.03 KB)

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2008-08

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Ohio Agricultural Research and Development Center

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Pennsylvania law requires covering of coal at bottom of last cut. This photo illustrates Pennsylvania grading. Location - near Pittsburgh. Item #5783

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http://hdl.handle.net/1811/97544

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Forestry Images (OARDC)