In this archived photo, Pittsburgh was still a city of “sweat and gold,” smoky and burgeoning with economic activity. Its population peaked that year, and a significant number were first and second-generation immigrants from Eastern Europe. Can yinz guess the year? @digspgh has the answer and more! #Pittsburgh #PGH #412 #Pittsburghhistory #PGDigs #PGPhotos #blackandwhite #retro #vintage