Since its debut in 1868, The World Almanac and Book of Facts has become the best-selling American reference book of all time, with more than 80 million copies sold. It is the source for essential and authoritative facts for entertainment, reference and learning...
http://www.worldalmanac.com/More Details>> The World Almanac
United States government profiles of countries and non-self-governing territories around the world. Information on geography, people, government, transportation, economy, communications, military, and transnational issues...
https://www.cia.gov/library/publications/the-world-factbook/More Details>> CIA World Factbook
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