Pittsburgh in the 1940s
Pittsburgh, Pennsylvania, August 1941.
Pittsburgh Photo Wall Collection - Pittsburgh PA Mill District
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Think Air Quality Doesn't Matter? Look at Pittsburgh in the 1940s
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Think Air Quality Doesn't Matter? Look at Pittsburgh in the 1940s
Point State Park (established 1950)
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Pittsburgh Air-Quality Problem Recalls the Bad Old Days - WSJ
Pittsburgh Air-Quality Problem Recalls the Bad Old Days - WSJ
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Think Air Quality Doesn't Matter? Look at Pittsburgh in the 1940s
Pittsburgh, PA Wood Mount Wall Art: Prints, Paintings & Posters
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Pittsburgh Photo Wall Collection - Pittsburgh PA Mill District
The industrial revolution and air pollution - ppt download