Dorsett Studios:
Duquesne Blast Furnaces
Dorsett Studios:
Duquesne works: Ore Bridges
Dorsett Studios:
Duquesne works blast furnace
Dorsett Studios:
U.S.Steel's Duquesne works
Dorsett Studios:
Duquesne Works
Dorsett Studios:
Duquesne works
Dorsett Studios:
Duquesne works
Dorsett Studios:
Duquesne works
Dorsett Studios:
U.S.Steel Duquesne works: Number 3 Blast Furnace
Dorsett Studios:
Duquesne Works
Dorsett Studios:
Duquesne Works U.S.Steel
Dorsett Studios:
Duquesne works
Dorsett Studios:
Duquesne, PA.