Selling an eighth book bundle of hot cover scientific American research books that was put out in the late 1980s. These are certainly collectible according to the prices that you see on the sites if you were to purchase these books. This is not a complete set although these are extremely good reference books that would certainly enhance a professional library. I am selling it as a bundle and the total weight is under 17 pounds. Makes a great gift or an instant library. Buying eight books in a bundle certainly saves you money and this is a very good price. Any questions please get back to me regards Big John, Houston Texas