1966. 6th Edition, Revised. 94 pages. Pictorial dust jacket over orange cloth. Binding remains firm. Pages are lightly tanned throughout. Pencil inscriptions to front free endpaper and rear pastedown. Boards have light shelf-wear with corner bumping. Very slight crushing to spine ends. Unclipped jacket has heavy edgewear with areas of loss, heavy tears, chips, and creasing. Light tanning to spine and edges. Water staining to spine. Ring mark to front panel.