About the DPLA:
The Digital Public Library of America brings together the riches of America’s libraries, archives, and museums, and makes them freely available to the world. It strives to contain the full breadth of human expression, from the written word, to works of art and culture, to records of America’s heritage, to the efforts and data of science. DPLA aims to expand this crucial realm of openly available materials, and make those riches more easily discovered and more widely usable and used, through its three main elements: a portal, a platform and public opinion.
and check out these and other exhibitions:
The History of American Public Libraries
Maps in American Culture