1973. 242 pages. Red and white jacket over black cloth. Black and white diagrams within. Pages are lightly tanned and thumbed at the edges, with light foxing. Binding has remained firm. Inscription to front endpaper. Boards are a little rub worn, slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are mildly crushed. Light tanning to spine and edges. Light wear to unclipped dust jacket with tears, nicks and creases to spine, edge and corners. Light tanning to spine and edges.