The National Archives and Records Administration (NARA) keeps 3% of all materials created in the course of conducting US federal government business important enough to preserve. A federal agency, NARA preserves, maintains, and provides access to documents that record important events in US history. To protect archives (including letters, memos, reports, and photographs documenting citizens' rights, federal officials' actions, and national experiences), NARA stores them in acid-free folders and boxes in dark spaces with consistent temperature and humidity. Some 95% of them are declassified. NARA is also developing an Electronic Records Archive. Created in 1934, NARA has offices in 17 states and Washington, DC.