DALLAS – Heritage Auctions is honored to announce one of the most thoughtful, comprehensive and bountiful American art events in recent memory. The catalog for the May 7 American Art Signature Auction reads like a syllabus, a history, and a love letter to the men and women who have defined and defied the American landscape for centuries, among them such names as Norman Rockwell, Albert Bierstadt, Andrew Wyeth, Thomas Moran, Thomas Hart Benton, and Grandma Moses. Absentee and Internet live bidding will be available through LiveAuctioneers.