The Atlas of Languages.
I have just started reading this massive work about history and interconnections of major Languages in history of men. The tom is truly very well and thoughtfully written by a group of people who not only are highly knowledgeable and intelligent in their desire to be resourceful, but truly passionate ! It's a rare find in any field of interest or science...And I am "crazy" about languages on the whole and major European major few, in particular. And the history of development of it around the globe. In some cases I disagree with authors, but their points of view are still interesting to me to debate on. This is the first work that I am truly enjoying so far. And it's well-illustrated, also.