London: George G. Harrap & Co. Ltd., (1961).. (1961).. Very good. - Octavo, green cloth. The spine & extremities are faded. The covers are lightly rubbed with some tiny white marks & with some light staining to the front cover. 156 pages. Color frontispiece, 4 pages of black-and-white illustrations & diagrams in the text. The contents are very good.