Sixth Edition. 128 pages. Paperback book with brown paper covers. Staple binding. Pages are mildly tanned, but text remains clear. Pages are firmly bound together, but textblock is peeling away from spine of cover. Rust marks surrounding staples. Visible water staining to top edge of textblock, affecting covers. Paper covers have minimal edgewear, with minor curling to corners. Spine is moderately scuffed and creased, heavier to ends.