1964. Second revised edition. 694 pages. Pictorial paper cover. Mercury books no. 32. Pages are water stained and warped to edges, but the text is unaffected. Otherwise, pages have slight tanning. Previous owner's inscription to front endpaper. Paper cover has several water stains and some warping. Otherwise, paper cover has minor wear with slight creases, some sunning and modest edge wear. Rather rubbed and marked overall.