1950. Fourth Edition. 198 pages. Illustrated dust jacket over blue cloth boards. Gilt lettering. Clean pages with light tanning and mild foxing throughout. Minor tanning to free endpapers due to dust jacket flaps. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is darkened. Minor wear marks to boards. Unclipped jacket. Panels and spine have light edgewear with tears and creases. Visible wear marks to spine and panels. Jacket is in removable plastic cover.