The World Almanac and Book of Facts is an American-published reference work and is the bestselling almanac conveying information about such subjects as world changes, tragedies, sports feats, etc. The almanac can be found in homes, libraries, schools, businesses, and media outlets throughout the United States and to a more limited degree in other parts of the world.It has been published yearly since 1868. The 2010 edition has 1,008 pages. There are mutiple Authors for the book.