1968. Sixth Edition. 220 pages. This is an ex-Library book. Illustrated dust jacket over brown cloth boards. Gilt lettering. Library copy, with expected inserts, stamps and inscriptions. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpaper and pastedowns. Front free endpaper is missing. Pen and tape marks to pastedowns and free endpaper. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Minor wear marks to boards. Unclipped jacket. Panels and spine have light edgewear with tears and creases. Visible wear and sticker marks to spine and panels.