Pre-Slag Valley, 1920

Photo Courtesy Archives of Industrial Society, Frick Museum

Pre-Slag Valley, 1920

Photo Courtesy Archives of Industrial Society, Frick Museum

Access Road, 1930s

Photo Courtesy Archives of Industrial Society, Frick Museum

Pre-Slag Valley, 1920

Photo Courtesy Archives of Industrial Society, Frick Museum

Wilkinsburg Culvert, 1950

Photo Courtesy Ted Rakovsky

Two Workers, 1930s

Photo Courtesy Archives of Industrial Society, Frick Museum