Every arrondissement of Paris photographed, c. 1880-1910. Because Atget shot many of these photos for art students to use as reference works or practice models, he tended to photograph in the early morning, before many people were up and working. As a result, he focuses mainly on the settings rather than teeming streets of a major city. I think this book would make an interesting companion to Simenon's novels, which occur in various of Paris's arrondissements, to get a feel for the atmosphere of the settings.