If you are going to go abroad, what book would you bring?

I will definitely take for Geo-Denography book; is a combination of Geography and Demography book that writes the nature of one's country that I am for it. And I must purchase it earlier than my departure date. It just look like an organizer, where the major details written in that book. The major tourist spots location map complete with the cultures, and all informative analytical data of road and route maps. It is an important book for me and I cannot make leave my country without it as it is included my important personal data in it as my back up copy. And also I have to take special care for this book while on my journey.

I would be bringing a book that tells everything about the certain country where Im going to. I want to read its history, culture, people, geography, etc.