Tibet - Venture to a High Plain (Lonely Planet Country Guide) (2002) is a really good book to get you into the feel of Tibet. It is packed full of useful information, travel routes, trekking, permits, places to stay and eat etc. and had a very useful glossary term and Tibetan and Mandarin Chinese basic languages phrases at the back.
The book recommends places to visit, costing, time of the year to visits what to see, transport links, what to be aware off, question to ask, what not to ask, what to avoid and the endless rounds of permits and stop checkpoints from the Chinese PSB.
Good travel book, interspersed with history, facts, stories and much useful information with many maps.