1 The CIA's World Factbook was created as an annual summary and update to the now defunct National Intelligence Survey (NIS) studies. The first classified Factbook was published in August 1962, and the first unclassified version was published in June 1971. The NIS program was terminated in 1973 except for the Factbook, map, and gazetteer components. The 1975 Factbook was the first to be made available to the public with sales through the US Government Printing Office (GPO). The year 2010 marks the 67th year of the World Factbook and its predecessor programs. The maps and flags are also from the World Factbook, which is an open source.