1977. Sixth edition. 140 pages. Pictorial dust jacket over pictorial paper covered boards. Black and white illustration plates. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Dedication to front free endpaper. Boards have mild shelf wear with light rubbing and corner bumping. Some mild marking and tanning. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Some tanning and foxing to all surfaces.