American Antiquarian Society

The American Antiquarian Society (AAS) is a national research library in Worcester, Massachusetts. AAS cultivates understanding of the American past, grounded in its ever-growing collection of printed and manuscript sources. Through wide-ranging programs, community engagement, and generously supporting researchers and students of early American history, the Society works to cultivate a broad community of inquiry, locally and nationally.

Since its founding in 1812 by Revolutionary War patriot and printer Isaiah Thomas, AAS has assembled one of the world's largest collections of books, pamphlets, broadsides, newspapers, periodicals, children's literature, music, and graphic arts material printed before the twentieth century in what is now the United States. The library of over four million items also includes a substantial collection of secondary texts, bibliographies, digital resources, and reference works. AAS is also a learned society with over 1,200 members, who are elected based on distinctive achievement in academic or public life.