1964. Seventh Edition. 608 pages. Illustrated dust jacket over red cloth covered boards. Pages are moderately tanned and occasionally foxed throughout. Minor pencil marking to front free end-paper. Pages 313-337 are dog eared. Binding remains firm. Boards have mild edge wear with slight rubbing to surfaces. Mild crushing to spine ends. Book has a slight forward lean. Board corners are bumped. Unclipped jacket has moderate edge wear with chips, tears and creasing.