Harvard Library is the umbrella organization for Harvard University's libraries and services. It 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 nation after the Library of Congress and Boston Public Library. Based on the number of items held, it is the fifth largest library in the United States. 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. History Harvard's library system grew primarily from personal donations, including from John Harvard and John Hull. John Harvard was a Puritan minister who accumulated 400 books spreading word of his faith. These volumes were left to Harvard, initiating the library's collection. The works in this collection soon became obsolete, as Harvard Library quickly changed to an academic institute and found little need for the theological titles. Until 1676, the library was based in Old College building. That year, it moved to Harvard Hall, where it remained until 1764 when the building and the library's entire collection was destroyed in a fire. The collection had 5,000 titles and was the largest collection in British America before the fire. By 1764 it was the largest library in British America, with 5,000 volumes, but disaster struck that year when the library was destroyed by fire. A new Harvard Hall was built, and 15,000 books were collected to create the new library. After the fire, readers in the library were not allowed candles or lamps and if there was a fire burning in the hearth, a librarian or assistant had to be present. Patrons were allowed to borrow and return up to three books at a time on Friday mornings and were allowed to keep them for up to six weeks. Thomas Hollis V, great-nephew of one of the university's early benefactors, began shipping thousands of specially