If anyone is looking for an interesting exploration of coffees history across the globe the book The Devil's Cup by Stewart Allen is a light hearted travelogue that digs into its history and impact on cultures across the centuries.
-And, while taking a break from that (excellent, I might add) book, you could do worse - a lot worse - than picking up Sebastião Salgado's "Scent of a dream", a photographic tour de force documenting how coffee is grown, processed and enjoyed around the world.
Heck, you could do a lot worse than picking up anything by Salgado...