1967. Sixth Printing. 543 pages. Illustrated paper cover with lettering. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Pen inscription to front free endpaper. Yellow pen highlight annotations and marginalia to pages throughout. Binding remains firm. Paper covers have moderate edge-wear with slight rubbing to surfaces and curling to corners. Lettering is bright and clear. Visible wear marks to spine and covers.