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They closed some 44 years ago, but Chicago's Union Stockyards profoundly shaped the development of the city and the modern world. Dominic Pacyga, a local historian and former stockyard worker, tells the story in his new book "Slaughterhouse.” Pacyga joins us tonight.

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Tonight's edition of Geoffrey Baer's Biking the Boulevards takes us on a tour through the McKinley Park and Back of the Yards neighborhoods.