The New York Public Library (NYPL) is one of the leading public libraries of the world and is one of America's most significant research libraries. It is unusual in that it is composed of a very large circulating public library system combined with a very large non-lending research library system. It is simultaneously one of the largest public library systems in the United States and one of the largest research library systems. It is a privately managed, nonprofit corporation with a public mission, operating with both private and public financing. Its flagship building, on Fifth Ave. running from 40th to 42nd Street in Manhattan, is a National Historic Landmark.
