1940. 3rd Edition Sixth Impression. 676 pages. No dust jacket. Red cloth with gilt lettering. Black and white illustrations throughout. Pull-out diagrams to pages 124 and 610. Binding remains firm. Pages are lightly tanned throughout. Illustrations and pull-out diagrams are bright and clear with some light tanning and foxing to edges. Some stains and markings to some pages. Tear to edge of diagram to page 124. Pencil inscription and sticker to front pastedown and endpaper. Boards have light shelf-wear with corner bumping. Light sunning to spine with crushing to spine ends. Hole to bottom edge of front board. Wear marks overall. Gilt lettering is bright and clear.