1970. First Printing. 284 pages. No dust jacket. This is an ex-Library book. Blue and grey cloth with black and white photograph to front board. Diagrams and black and white photographs throughout. Pages remain bright and clear. Light tanning and marking to textblock edges. Binding is firm. Library label and stamp to front endpapers. Boards and spine have minimal shelf-wear, with mild corner bumping and crushing to ends. Heavy marking overall. Mild scuffing to spine. Book has a minor backwards lean.