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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for proper ventilation, gas and dust.
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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for proper ventilation, gas and dust.

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

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

Subjects
pennsylvaniapittsburghallegheny countysafety film negativesunited states
Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for proper ventilation, gas and dust.. 1942-01-01. Collier, John, Collier, John, Jr.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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