These books are prefect for the price they contain the information as advertised. The Hardcover binding is excellent. For the price the glued binding is to be expected other than that these are excellent volumes and you can expected these to last one generation easily. These books if they had been sown would have lasted many generations. The print in these volumes is excellent there was a review stating that this was a problem this problem clearly has been rectified. I would have given it 5 stars if these books had been sown and not glued.