Public domain
Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. After a face of coal has been "cleaned up', an electrically driven cutter undercuts the face with a three foot deep cut. Above this undercut, and near the roof of the face, holes are drilled which take the powder
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Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. After a face of coal has been "cleaned up', an electrically driven cutter undercuts the face with a three foot d. 1942-01-01. Collier, John, Jr., Collier, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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