1964. 2nd edition. 155 pages. No dust jacket. Illustrated cloth. Foreword by William A R Thompson. Graphs and charts throughout. Pages have slight foxing, tanning and minor thumbing. Foxing more intense towards the start and end of the book and on text block edges. Bookseller's sticker to front pastedown. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards a little rubbed and marked overall. Heavy liquid staining to front.