1965. 20th Printing. 247 pages. Illustrated paper cover. X233 edition with unabridged textblock. 3'6 price on front cover. Clean pages with light tanning and mild foxing throughout. Minor tape marks to first and last pages textblock and reverse front covers. Pen markings to last page textblock. Binding remains firm. Paper covers have mild edge-wear with slight rubbing to surfaces and curling to corners. Minor wear marks to covers.