A good book, but a bit abbreviated at times. It is best used along with The Complete Tolkien Companion by J.E.A. Tyler, which is far more in depth. A good look into Middle-earth myth, though, and I would recommend it for those people who can't get enough Tolkien (like me!).
Thoroughly engaging and informative, this book is so, So, SO much more than a simple bestiary of Tolkien's worlds. It is almost a complete history from the Making of Arda ----> and beyond. Reading it one can see at a macro level all that has transpired of note.
It details races, animals, monsters, EVEN TREES! Major events are also prominently featured in beautifully rendered color artwork. It is truly a work that I believe Tolkien would have been proud to see affiliated with his universe. Excellent!