1970. 16th Edition, Revised. 250 pages. Pictorial dust jacket over blue paper covered boards. Black and white photographs throughout. Binding remains firm. Pages and photographs are lightly tanned throughout. Water staining to top edge of some pages, text remains unaffected. Pencil marking to rear free endpaper. Boards have light shelf-wear with corner bumping. Light tanning to spine and edges with crushing to spine ends. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Light tanning to spine and edges. Water staining to all panels.