Public domain
Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Transportation within the mine is as carefully planned and coordinated as in a busy freight yard. A system of block signals and switches and miles of track make it possible to move out thousands of tons of coal a
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Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Transportation within the mine is as carefully planned and coordinated as in a busy freight yard. A system of bl. 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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