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You searched for: Date undated Remove constraint Date: undated Medium print Remove constraint Medium: print Topical Subjects Coal Mines and Mining--Mine Interiors--Machinery. Remove constraint Topical Subjects: Coal Mines and Mining--Mine Interiors--Machinery.
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Modified longwall mining with a German coal planer. Progress report 2: Completion of mining in three adjacent panels in the Pocahontas No. 4 coal bed, Helen, W. Va; If this photograph is used for publication, please give credit to the Bureau of Mines, United States Department of Interior.

1. Wood Crib Constructed with Crib Releases

IDNO:
002750
Title:
Wood Crib Constructed with Crib Releases
Date:
undated
Description:
Modified longwall mining with a German coal planer. Progress report 2: Completion of mining in three adjacent panels in the Pocahontas No. 4 coal bed, Helen, W. Va; If this photograph is used for publication, please give credit to the Bureau of Mines, United States Department of Interior.