1974. No Edition Remarks. 98 pages. No dust jacket. This is an ex-Library book. Green cloth with gilt lettering to spine. Contains black and white photographic frontispiece, with diagrams throughout. Pages are lightly tanned, but text remains clear. Binding is firm. Library labels and stamps to front endpapaers. Boards and spine have minimal shelf-wear, with mild corner bumping and crushing to ends. Gilt remains bright. Light rubbing and scuffing overall. Label to tail of spine.