The University of California operates the largest academic library system in the world. It manages more than 40.8 million print volumes in 100 libraries on ten campuses. The purpose of these libraries is to assist research and instruction on the University of California campuses. While each campus library is separate, they share (through the UC library system) facilities for storage, computerized indexing, digital libraries and management. For example, each campus maintains its own computerized library catalog and simultaneously participates in the systemwide union catalog, MELVYL.