1945. First Edition. 275 pages. Blue dust jacket over blue cloth. Contains various diagrams and tables. Minor tanning to pages with heavier foxing and tanning to pastedowns and endpapers. Notable tanning to text block edges as well. Cloth reinforcement to inner hinges. Boards have visible rubbing and moderate bumping to corners. Fair crushing to spine ends. Unclipped jacket with visible tears to the edges, corners and spine and edge wear. Heavy sunning to spine and small areas of loss to spine ends. Some faint wrinkling to front panel.