Prints and pilgrimage: 1790s1850s -- "Keep it the home of Washington!": the Mount Vernon Ladies' Association of the Union, 1854-1890 -- Replicas, replicas, replicas: 1890s1920s -- Battles of "authenticity": replicas and research in the 1930s -- "In this changing and troubled world": social history and the American roadside, 1950s1980s