KEENE, N.H. (AP) - The only known copy of a Mary Pickford movie that marked an important turning point in the silent film star's career is being shown in New Hampshire next month, seven years after it was discovered in an old barn. A contractor found the 1911 film, titled "Their First Misunderstanding," and six others while cleaning out a barn ahead of its demolition. He and the property owner donated it to the film department at nearby Keene State College, which has been working to identify and restore the movies. The Pickford film is particularly significant because it was the first for which she was given credit in advertising materials. Pickford was known as "America's Sweetheart." She also helped found the United Artists studio.