The UCLA Library system is one of the largest academic research libraries in North America, with a collection of over twelve million books and 100,000 serials. The system is spread over 12 libraries, 12 other archives, reading rooms, research centers and the Southern Regional Library Facility, which serves as a remote storage facility for southern UC campuses. It is among the ten largest academic research library systems in the United States, and its annual budget allocates $10 million for the procurement of digital and print material. It is a Federal Depository Library, California State Depository Library, and United Nations Depository Library.