Vintage 1953 Grolier Book of Knowledge 20 Volume 10 HC Book Set: Set of twenty volumes in ten hardcover books. + 3 Bonus The Children's Institute Guides: School Subject Guide; Graded Courses of Study; Character Education. Good Pre-owned Vintage Condition: Clean and intact. - Book covers and guides show various signs of wear. Pages are tanned from age with age-spots. Please See Photos for Condition and Description. Free Domestic Priority Shipping for Better Tracking. 10% Discount offered on multiple orders from my store. --I have other motivational literature in my store or just now coming / listing, so please check back. - 15% Discount offered on orders of 3 items. - 20% Discount on orders of 4+ items. Discounts are given manually after purchase has been made (b/c I haven't figured out how to do it otherwise : - ). Thanks for Looking!