Anthropology/Missiology
This is a great reference if you're planning a missions trip, as it gives a statistical overview of every country in the world, covering size, peoples, literacy, capital city and population numbers, economy, politics, and religions.
It then gives further insights into the culture and the response of the people there to the gospel throughout history. It tells of the most unreached sectors of the population and overviews any relevant social issues and the individual country's missionary vision. You can check its' accuracy by reading about a country you know well.
The book is frequently updated due to changing statistics.
It can be used for devotions as well, because there is a reading for each day of the year, so you can learn about different countries and pray intelligently for the various countries and people groups.
