The Index is open to the public all year. During the academic months, hours are from 9:00 a.m. to 5:00 p.m. from Monday to Friday. From mid-June to mid-September, hours are from 9:00 a.m. to 4:00 p.m. Monday to Friday. The Index is closed on weekends, major holidays and for two weeks at Christmas. Visitors are welcome at all open hours and notice of an impending visit is not necessary. Tours of the Index can be organized provided advance notice is given. Computer access to the Index database is available within the archive.