Harvard University Library is the oldest library in the United States and the largest university library in the world. Eight American presidents and 33 Nobel Prize winners have studied here. In the development of more than 400 years, * * * has a collection of books150,000 volumes. These comprehensive library resources with ideological wisdom play an important role in the study and research of Harvard teachers and students. Harvard University Library (system) is the largest university library in the world, with more than150,000 volumes. Including more than 90 academic branches of different majors, located in Boston, Washington, D.C., Florence, Italy and other cities in the world. There are 49 campuses in the headquarters of Harvard University alone. Among them, Widner Library is the largest library in the headquarters of Harvard University, and the building with ten storerooms is magnificent. Adjacent to the Widner Library are the Museum of Maps, Archives and Drama, Horton Library and the University Library of Lemont. Most of the cultural resources collected by Widner Library come from some European and American countries, such as Britain, Germany, France and Greece. , and collected the original works in more than 0/00 languages around the world. The collection resources cover all disciplines of the school, especially medicine, electronic telecommunications, chemical engineering, machinery, economic management, language and literature, philosophy and history, anthropology and so on. At the same time, there are laboratories in more than 60 countries and regions in the Middle East and Central Asia, with books and periodicals in 45 languages, as well as rich microfilm and audio-visual materials, which provide rich resources for academic research and cultural exchanges. Previously, there were "Twenty Notes of Harvard University Library" on the Internet, and even the author published a book "Notes on the Wall of Harvard University Library", but in fact, the Harvard University Library did not describe the twenty notes, all of which were fabricated by netizens.