Arkivism
Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mined out area which is being collapsed by pulling out all roof supports and all timbering
Public domain

Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mined out area which is being collapsed by pulling out all roof supports and all timbering

Collier, John, Jr., Collier, John · 1942-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
pittsburghnitrate negativespennsylvaniaunited statesallegheny county
Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mined out area which is being collapsed by pulling out all roof supports and all timbering. 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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