This week on Q&A, it's a rare interview with one of America's leading historians. We tour the New York City office and home library of Pulitzer Prize-winning bestselling biographer Robert Caro, who is currently working on the final volume of his 5-volume biography of Lyndon Johnson. During the tour, Mr. Caro talks about his research and writing process on the LBJ series, and the impact of "The Power Broker," his bestselling 1974 biography of NYC Parks Commissioner Robert Moses.

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