Wikimedi'Òc

VIEW OF THE SKYLINE AT PITTSBURGH, PENNSYLVANIA. LINING BOTH SIDES OF THE MONONGAHELA RIVER IN THE FOREGROUND ARE... - NARA - 557227.jpg - US National Archives bot

PITTSBURGH, PENNSYLVANIA, DOWNTOWN BUILDINGS ARE SEEN THROUGH HAZE AND FRAMED BY A PORTION OF A JONES AND LAUGHLIN... - NARA - 557231.jpg - US National Archives bot

SLAG WHICH HAS BEEN DUMPED AT THE SOUTHSIDE PLANT OF THE JONES AND LAUGHLIN STEEL CORPORATION AT PITTSBURGH... - NARA - 557232.jpg - US National Archives bot

PENNANT FROM A PENNSYLVANIA STATE PATROL BOAT FRAMES AN OUTFALL OF A BLAST FURNACE AT THE JONES AND LAUGHLIN STEEL... - NARA - 557244.jpg - US National Archives bot

BOOMS HAVE BEEN PLACED ACROSS VARIOUS WATERWAYS LEADING TO THE OHIO RIVER TO TRAP OUTFALLS OF OIL ACIDITY CONTENT... - NARA - 557249.jpg - US National Archives bot