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.
Heidelberg University
The University Library is the main library of the university, and constitutes together with the decentralized libraries of the faculties and institutes, the integral university library system comprising approximately 6.7 million printed books. It is Germany's most frequently used library, and it is currently placed 1st in a ranking of Germany's best libraries. The University Library's stocks exceeded one million in 1934. Today, it holds about 3.2 million books, about 500,000 other media such as microfilms and video tapes, as well as 10,732 scientific periodicals. Moreover, it holds 6,600 manuscripts, most notably the Codex Manesse, 1,800 incunabula, 110,500 autographs, and a collection of old maps, paintings, and photographs. The further 83 decentralized libraries of the faculties and institutes hold another 3.5 million printed books. In 2005, 34,500 active users of the University Library accessed 1.4 million books a year. The conventional book supply is complemented by numerous electronic services. Around 3,000 commercial scientific journals can be accessed via e-journal. The University Library of today traces its roots back to the purchase of a chest of documents by the first Rector Marsilius von Inghen in 1388, which was stored in the Heiliggeistkirche, then the University Cathedral. Since 1978, the science branch of the University Library serves the institutes of natural sciences and medicine on the New Campus. In 2016, extensive refurbishments were finalized with the University Library now housing additional study spaces. 
Heidelberg University founded a in Santiago, Chile in 2001. It has the task of organizing, managing, and marketing the courses of study maintained either independently by Heidelberg University or in cooperation with the Pontifical Catholic University of Chile and the University of Chile. The center has responsibility for programs of postgraduate education. It also coordinates the activities of Heidelberg University in Latin America, and provides a platform for scientific cooperation.