1967. 4th Edition. 224 pages. Pictorial dust jacket over green cloth. Black and white illustrations throughout. Binding remains firm. Pages and illustrations have light tanning and foxing throughout. Previous owner's inscriptions to front pastedown and top edge of text block. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Wear marks overall.