To write the book about the new National Museum of African American History and Culture, Mabel O. Wilson pored over architecture drawings and environmental impact reports, and interviewed dozens of people involved in the project, including architects, a structural engineer, and John Lewis, the civil rights leader and Georgia Congressman who helped win government support for its construction. The result is Begin with the Past: Building the National Museum of African American History and Culture, the official Smithsonian Institution history of its 19th museum, which opens on Washington, D.C.’s National Mall on Sept. 24.