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

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

Ohio Agricultural Experiment Station. Dept. of Forestry.
URI: http://koha.mediu.edu.my:8181/xmlui/handle/2374
Date: 2013-10-16

Description:

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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