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The University of California, Berkeley's 32 constituent and affiliated libraries together make it the fourth largest academic library in the United States, surpassed only by the Library of Congress, Harvard, and Yale. As of 2006, Berkeley’s library system contains over 10 million volumes and maintains over 70,000 serial titles. The libraries together cover over 12 acres of land and compose one of the largest library complexes in the world. In 2003, the Association of Research Libraries ranked it as the top public and third overall university library in North America based on various statistical measures of quality.