This is a book about Philadelphia and about photography, but it is not the usual book about either. On one level, this is the pictorial story of a great industrial metropolis in transition. It is the story of a railroad city, a city of trolleys and subways and horse-drawn vehicles, as it gradually succumbed to the automobile. It is the story of a city filled with neighborhood industry giving way to suburbs, to commuter travel, and to a change in the very nature of work. It is the story of a city spreading out, expanding and doubling in population in fifty years. It is the story of urban...