Robert Van Koesveld has published a wonderful book on Bhutan, and entitled it Bhutan Heartland. The details of the book are available on a sub-section of Robert's website.
When I got it, I experienced a twinge of envy at Robert's talents as a photographer, and how well produced this book was. Joining Robert in the task of putting this book together is his wife Libby Lloyd.
Bhutan Heartland explores the culture, history, beliefs and dazzling Himalayan landscapes of this wonderful country, known as Druk Yul...and where smoking in public places is against the law!
Nine chapters make up this hardback book of 210 pages. Robert and Libby have taken their readers from Paro in the west of the country to its east, traveling through the high passes of Dochu La and others, meeting monks, nuns, lamas...stopping at Ogyen Choling and documenting the various exuberant tsechu festivals...and end up with silk weavers and yak herders.
If you decide to visit Bhutan (and you must!!!), this is the book you ought to read. It's not a guidebook, but the amount of informed research in it was new to me, informative and interesting...and I've already been to Bhutan about 4 times!!!
Well recommended. You can buy it from Robert's website or order it from major booksellers such as B&N.