Yearbooks are annual publications that provide information about the previous year. The Statesman's Yearbook provides key historical events, leaders, statistics, and more for different countries. It is available in print and online with a subscription. The CIA World Factbook provides maps and facts about 266 world entities and can be freely accessed online. It would contain information like a country's Gross National Product. Mental Measurements Yearbook reviews standardized tests to help professionals select and use them.