Système universitaire de documentation or SUDOC is a shared database used by the libraries of universities and other higher education institutions in France. It identifies, tracks and manages the documents which they hold. The SUDOC online catalog has more than 10 million references. It allows students and researchers to find bibliographical and location information in over 3,400 document centers. It is maintained by the Agence bibliographique de l'enseignement supérieur (Bibliographic Agency for Higher Education).