1960. Fifty-third Printing. 428 pages. No dust jacket. Blue cloth boards with gilt lettering. Black and white illustrated frontispiece. Volume 20. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. 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.