By the Central Intelligence Agency
Published annually by the CIA, the World Factbook is a collection of information about every country in the world. It includes maps and covers topics like culture, government, and history.
Project Gutenberg has a Kindle version of the 2010 Factbook. You can also download this year’s Factbook directly from the CIA’s website, but you’ll need to convert the files or just read it on your computer. (Note: Some 2011 versions are being sold on Amazon, but I can’t recommend any of them.)