(a) The exhibit areas' hours of operation are posted at http://www.archives.gov. Last admission to the exhibit areas of the building will be no later than 30 minutes before the stated closing hour. The Archivist of the United States reserves the authority to close the exhibit areas to the public at any time for special events or other purposes. The building is closed on Thanksgiving and December 25. [75 FR 71547, Nov. 24, 2010]