This is the 7th edition, 1956 by Bonanza Books. The book is in excellent condition, with a previous owners sticker on the first blank page, otherwise no damage, or defects. All pages are present, no missing pages or writing or damage or discoloration of any kind. There are 223 illustrations and diagrams. The jacket does have losses at the top of the spine and the forward edge a the top corners, and does show wear on the leading edge. The ja...cket is protected with mylar plastic. Buyer pays 5.00 shipping in the United States.