From Library of Congress:
With approximately two-thirds of the books and periodicals in its collections in languages other than English, the Library of Congress is truly an international resource. It houses information on virtually every country, region, national, ethnic, and religious group, often equal to or surpassing collections found elsewhere. For example, the Library's Chinese, Russian, Japanese, Korean, and Polish collections are the largest outside of those countries, and the Arabic collections are the largest outside of Egypt. The collection of Luso-Hispanic materials is the largest in the world; its collection of Judaica ranks among the largest anywhere.