Laminated soft cover is corner worn with large waterstain at front. Page block is grubby. Pen marks on contents pages. Highlighting on pages 93-97, 105. Pencil underlining on pages 57-72. Some dog-eared pages. Corners of early and last pages are lightly worn. Library plate on front inside cover. Library stamps on some prelims pages and top of page block. Illustrated with numerous diagrams and tables.