List of the largest libraries in the United States
The largest public library in the United States—and the largest library in the world—is the Library of Congress in Washington, D.C., which is the "de facto" national library of the United States. It holds more than 167 million items, including "more than 39 million books and other printed materials, 3.6 million recordings, 14.8 million photographs, 5.5 million maps, 8.1 million pieces of sheet music and 72 million manuscripts." Other than the Library of Congress, the largest public library in the United States is the New York Public Library, while the largest research library in the United States is the Harvard Library.
Hillman Library
The University Library System (ULS) is the University of Pittsburgh's largest library organization and is administered by the Hillman University Librarian and Director, ULS. The organization in its current form dates back to 1982, when the University combined the administration of its libraries for the Graduate Schools of Business, Public and International Affairs, and the School of Library and Information Sciences with that of the Hillman Library and its branches. From the early 1980s the library system adopted many new services and resources alongside the evolution of computer technology including, most notably, the installation and unveiling of its first online catalog based on the NOTIS integrated library system.