On Aggression by Konrad Lorenz
1968. Reprint. 273 pages. Paperback book with pictorial paper covers. Pages are lightly tanned, but text remains clear. Binding is firm. Pencil mark to first page. Paper covers have minimal edgewear, with minor curling to corners. Moderate creasing and water staining to spine, with slight tearing to ends. Noticeable marks overall.