The American Antiquarian Society (AAS), located in Worcester, Massachusetts, is both a learned society and national research library of pre-twentieth century American History and culture. AAS was founded by Isaiah Thomas on October 24, 1812 by an act of the Massachusetts General Court. Its main building, known also as Antiquarian Hall, is a U.S. National Historic Landmark. The mission of the AAS is to collect, preserve and make available for study all printed records of what is now known as the United States of America. This includes printed records from first European settlement through the year 1876.