The National Archives and Records Administration (NARA) is the nation's record keeper. It keeps only those Federal records that are judged to have continuing value—about 2 to 5 percent of those generated in any given year. By now, they add up to a formidable number, diverse in form as well as in content. There are approximately 9 billion pages of textual records; 7.2 million maps, charts, and architectural drawings; more than 20 million still photographs; billions of machine-readable data sets; and more than 365,000 reels of film and 110,000 videotapes. All of these materials are preserved because they are important to the workings of Government, have long-term research worth, or provide information of value to citizens.