Harvard Library

Harvard Library is the network of libraries and services at Harvard University, a private Ivy League university in Cambridge, Massachusetts. Harvard Library is the oldest library system in the United States and both the largest academic library and largest private library in the world. Its collection holds over 20 million volumes, 400 million manuscripts, 10 million photographs, and one million maps.

Harvard Library holds the third-largest collection of all libraries in the world, after the Library of Congress and Boston Public Library, by number of volumes held. Among libraries, measured on the number of all items held, it is the fifth-largest library in the nation. Harvard Library is a member of the Research Collections and Preservation Consortium (ReCAP); other members include Columbia University Libraries, Princeton University Library, New York Public Library, and Ivy Plus Libraries Confederation, making over 90 million books available to the library's users.   

The library is open to current Harvard affiliates, and some events and spaces are open to the public. The largest and most recognized building in the Harvard Library system is Widener Library in Harvard Yard. Provided by Wikipedia