In order to correct a critical problem in its cataloging sub-system. the Online Catalog will be undergoing emergency maintenance between 2:00 p.m. and 5:00 p.m. on Friday, September 6th. During this time the online catalog and cataloging will be off-line. Patrons will not be able to look up books. Books will be able to be checked out, but the library staff will be unable to modify due dates. The fix to the system should take about 30 minutes, but the entire maintenance window is reserved.