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Working class --- Industries --- Popular culture --- Culture, Popular --- Mass culture --- Pop culture --- Popular arts --- Communication --- Intellectual life --- Mass society --- Recreation --- Culture --- Commons (Social order) --- Labor and laboring classes --- Laboring class --- Labouring class --- Working classes --- Social classes --- Labor --- Employment --- Pittsburgh (Pa.) --- Pittsburg (Allegheny County, Pa.) --- Pgh. (Pa.) --- Dayaogeh (Pa.) --- City of Pittsburg (Allegheny County, Pa.) --- City of Pittsburgh (Pa.) --- Social conditions.